Trajectory of the COVID-19 pandemic: chasing a moving target
Review Article

Trajectory of the COVID-19 pandemic: chasing a moving target

Kamal Kant Sahu1, Ajay Kumar Mishra1, Amos Lal2^

1Department of Internal Medicine, Saint Vincent Hospital, Worcester, Massachusetts, USA; 2Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota, USA

Contributions: (I) Conception and design: All authors; (II) Administrative support: None; (III) Provision of study materials or patients: All authors; (IV) Collection and assembly of data: All authors; (V) Data analysis and interpretation: All authors; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

^ORCID ID: 0000-0002-0021-2033.

Correspondence to: Amos Lal, MBBS, MD. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota 55902, USA. Email:;

Abstract: The spread of COVID-19 has already taken a pandemic form, affecting over 180 countries in a matter of three months. The full continuum of disease ranges from mild, self-limiting illness to severe progressive COVID-19 pneumonia, multiorgan failure, cytokine storm and death. Younger and healthy population is now getting affected than before. Possibilities of airborne and fecal oral routes of transmission has increased the concern. In the absence of any specific therapeutic agent for coronavirus infections, the most effective manner to contain this pandemic is probably the non-pharmacological interventions (NPIs). The damage due to the pandemic disease is multifaceted and crippling to economy, trade, and health of the citizens of the countries. The extent of damage in such scenarios is something that is beyond calculation by Gross Domestic Product rate or currency value of the country. Unfortunately, unlike many other diseases, we are still away from the target antiviral drug and vaccine for severe acute respiratory syndrome (SARS-CoV-2) infection. The prime importance of NPIs like social distancing, staying in home, work from home, self-monitoring, public awareness, self-quarantine, etc. are constantly being emphasized by CDC, WHO, health ministries of all countries and social media houses. This is time of introspection and learning from our mistakes. Countries like China and South Korea who were initially the most hit countries could contain the disease spread by liberal testing of their population, stringent quarantine of people under investigation and isolation of the positive cases. Rest of the countries need to act urgently as well to bring an immediate halt in the community transmission.

Keywords: COVID-19; coronavirus; pandemic; infection; vaccine

Submitted Mar 23, 2020. Accepted for publication May 18, 2020.

doi: 10.21037/atm-20-2793


Wuhan, a city in Hubei province of Eastern China has an approximate population of 11 million people. As per epidemiologists, this city is considered as an epicenter for current COVID-19 pandemic (1,2). Subsequently, it involved other parts of China and then to the rest of the world. As of 19th March 2020, there are 244,979 confirmed cases in 180 countries with 10,035 deaths (3). Worst hit countries are China, Italy, South Korea, Iran, France, Spain, Germany and many other European countries (Figure 1). Italy surpassed China on 19th March 2020 in terms of having the highest number of active COVID-19 cases and more deaths (3).

Figure 1 COVID-19 pandemic burden worldwide.

Disease background

Coronavirus family

Severe acute respiratory syndrome (SARS-CoV-2) belongs to the family of Beta coronavirus which also has coronaviruses responsible for previous outbreaks—SARS and the Middle East respiratory syndrome (MERS) outbreaks.

Possible routes of transmission

In the initial phase, most COVID-19 cases in China were found to have a direct or indirect link to Huanan Seafood Market in Wuhan, possibly due to the zoonotic spill over from wild animals to the humans (4). Gradually, as the transmission passed beyond 1st and 2nd generations, more cases were reported to have no direct link with the animal exposure and were instead related to community transmission from person to person (5). Currently, there is enough evidence to suggest that respiratory droplets and direct contact with contaminated surfaces are the two most common routes of SARS-CoV-2 transmission. Just like in many endemic diseases, other possible routes like airborne or faecal oral transmission is being explored for SARS-CoV-2 transmission (6,7). Now with each passing day, most of the COVID-19 cases are as a result of “community spread” which means SARS-CoV-2 virus seems to be easily sustaining and spreading in the community with most of the affected population unaware of how or from where they became infected.

Demographic details of the patients

SARS-CoV-2 viral infection can affect any individual in a naïve susceptible population. Most retrospective studies had cohort with age range between 50–80s (8,9). In addition to this, there are also studies reporting no deaths in those under age 30 from Korea or under age 50 from Japan (5). These results were falsely perceived or at least fail to alert the younger population especially the so called “millennial generation” individuals, most of them started thinking that they are immune to this virus. The sense of false security and illusion did not persist long enough as now we have concrete data from United States (US) that harbours close to 20,000 COVID-19 cases. As per The Centres for Disease Control and Prevention (CDC), more younger patients in US are catching SARS-CoV-2 infection. In their report dated 20th March 2020, CDC mentions that 20% of the hospitalized patients and 12% of the intensive care patients from US belong to age range of 20 to 44 years (10). Amongst the comorbidities, hypertension, cardiovascular disorders, cerebrovascular disorders and diabetes are the top medical conditions who had more severe disease and required intensive care as compared to individuals without these comorbidities (7-16). Specific subset of population like patients suffering from cancer, transplant recipients or other benign blood disorders need special attention for their underlying disease (17-20).

Symptomatology and laboratory investigations

Symptomatology and Mortality rate of COVID-19 cases

In general, most SARS-CoV-2 affected patients have only mild symptoms, with approximately 20% developing moderated to severe illness (21). This means that most patients can be managed with home quarantine only and hospital isolation is required only for moderate to sick population. The likelihood of having more severe disease is multifactorial. Vulnerable population as per the available literature are older individuals more than 60 years, pregnant women, patients with multiple comorbidities and immunosuppressed individuals like cancer patients (1,20,22-28). With regards to the gender predisposition, there are mixed reports with some mentioning that males have higher chance of acquiring the infection with higher mortality rates when compared to females. The age subgroup which has the highest mortality are the older individuals as compared to the younger population. The Special Expert Group for Control of the Epidemic of Novel Coronavirus Pneumonia of the Chinese Preventive Medicine Association has recently reported the epidemiological characteristics of COVID-19 cases (29,30). As per the report, the overall crude morality rate was 2.3%, with 14.8% in the age group over 80 years old, 2.8% in men and 1.7% in women. Individuals with HIV, hematopoietic stem cell transplantation, pregnancy is always at risk of acquiring atypical viral infections and hence such patients have higher chance to acquire COVID-19 disease (31-35). The most common reported symptoms were high grade fever, dry cough, shortness of breath and fatigue as the most common presenting features. Nausea, vomiting and other gastrointestinal symptoms were rarely reported. Recent reports have shown that patients with severe COVID-19 had higher cardio-cerebrovascular events than the milder cases (36,37).

Blood work and their significance

Laboratory studies including complete blood count, renal function test, liver function test, coagulation profile, D dimer, serum calcitonin are the common lab tests for hospitalised COVID-19 patients. Various inflammatory markers like C-reactive protein (CRP), procalcitonin, ferritin, D-dimer, interleukin 2 (IL-2) are shown to be elevated in patients with COVID-19 and have been found to be associated with vital organs dysfunction (38,39).Wang et al. in their case series of 138 hospitalised patients reported following laboratory abnormalities: lymphopenia (70.3%), deranged coagulogram (58%), elevated lactic acid dehydrogenase (39.9%) and abnormal imaging findings (100%). Presence of lymphopenia, elevated D dimer values, deranged renal functions have been reported as poor prognostic factors with high chance of need of intensive care with high mortality (7,8). Other hematological parameters like thrombocytopenia has been found to be predicting the severity and worst prognosis (40,41).

Diagnostic modalities: how to investigate a suspected case?

COVID-19 RT-PCR testing

Amongst the available investigations, the COVID-19 real-time reverse transcription polymerase chain (RT-PCR) test is used for the qualitative detection of nucleic acid from SARS-CoV-2 virus. Samples can be used taken from upper or lower respiratory areas like swabs, sputum, lower respiratory tract aspirates, and bronchoalveolar lavage. It is important to note that a positive COVID-19 result by RT-PCR does not rule out the concomitant bacterial infection or other viral infections at the same time. Similarly, a negative result does not exclude SARS-CoV-2 infection altogether and hence must not be used as a sole parameter for diagnostic purposes. Hence, we emphasize that if clinical suspicion is high, the ideal approach should be to evaluate the suspected patient based on the combination of clinical symptoms, contact history, and other dynamic blood changes to identify COVID-19. CDC as laid down guidelines on how to interpret the results and suggested on repeating the test in case the of high clinical suspicion after consultation with public health authorities (Table 1) (42).

Table 1
Table 1 Interpretation of COVID-19 RT-PCR test based on CDC guidelines
Full table

Computed tomography (CT imaging) of the chest

As mentioned above, if clinically indicated, imaging studies like computed tomography (CT) of the chest should be done to evaluate the patient’s low respiratory symptoms (43,44). Ai et al. did a comparative study involving 1,014 patients, to compare CT imaging with RT-PCR for their sensitivity (45). They found that 88% (888/1,014) had positive chest CT scans while only 59% (601/1,014) had positive RT-PCR results. Classical positive CT findings included ground-glass opacities (GGOs), local patchy shadowing, bilateral patchy shadowing, or interstitial abnormalities. Fang et al. also had similar finding in their series of 51 patients, the sensitivity of CT was 98% compared to RT-PCR of 71% (P<0.001) (46). While, it is gratifying to know that CT scan could complement RT-PCR for its higher sensitivity, however we should also acknowledge that there might be no radiographic abnormality in less severe cases or in those cases who present early to hospital (43,47,48). Guan et al. did not find any CT abnormality in 157 of 877 patients (17.9%) with no severe disease and in 5 of 173 patients (2.9%) with severe disease. On similar lines, report by Bernheim et al. on 121 symptomatic COVID-19 patients, suggested that 27 (22%) had normal CT findings at initial presentation (48). They studied these patients at follow up as well with a repeat CT scan and found that with a longer time after the onset of symptoms, more patients had positive CT findings including consolidation, bilateral and peripheral disease, and GGOs (48). Lastly, this is to note that there are no pathognomonic radiological features that can confidently differentiate COVID-19 from other causes of lung infiltrates (49-54).

Trajectory of COVID-19 pandemic: how different countries are tackling?

Rise of the pandemic: when to act and how to act?

In most cases, a pandemic disease goes through the typical phases of spread from a local outbreak à nationwide epidemic à pandemic worldwide steps. Depending on the region of outbreak, few regions or countries might not get time to prepare themselves to act efficiently and promptly unless their taskforce is already on toes by default, while other distant countries where the disease has still not reached may get some time to prepare themselves. The damage due to the pandemic disease is multifaceted and crippling to economy, trade, and health of the citizens of the countries. The extent of damage in such scenarios is something that is beyond calculation by Gross Domestic Product rate or currency value of the country. That is why it is important to learn from past experiences of outbreaks and have a framework/guideline set before hand with regular mock drilling from time to time to ensure they are constantly validated and updated. For instance, countries like Singapore, and Japan who have successfully contained the current COVID-19 pandemic have learned a good lesson from SARS epidemic back in 2003 when they made stringent guidelines.

How to flatten the curve: “suppression” versus “mitigation”, which one is better?

Comparing the trajectory of COVID-19 pandemic of various countries is a litmus test of the extent of preparedness of various countries and public awareness. An infectious pandemic like COVID-19 can be tackled in two ways: (I) suppression strategy, which focuses to reverse epidemic growth; (II) mitigation strategy, which stresses more on slowing than stopping epidemic spread.

  • Suppression strategy and its feasibility. Although initially China and South Korea were heavily struck by COVID-19, but with their suppression strategy, which is an intense intervention model, these two countries are able to flatten their respective curves of COVID-19 pandemic. China, and South Korea have followed the “suppression protocol” by locking down their major cities, social distancing the entire population, case isolation, home quarantine and by closing schools and universities. The most challenging aspect of suppression strategy is the relapse with appearance of new cases as soon as suppression loosens. Probably this is the reason that we are still seeing the pockets, or a cluster of cases being reported from these countries. The “generous screening strategy” allowed South Korea to accurately estimate the COVD-19 burden to guide them. They subsequently took a massive task, implemented a nationwide public health measures along with strict lockdown of cities and legal penalties against the law breakers which helped them timely mitigate the spread of virus.
  • Mitigation strategy and its effectiveness. Singapore has a well-established framework in place: the MOH Disease Outbreak Response System which always keeps Singapore on toes and has a generic preparedness model and response plan against any outbreak. The Disease Outbreak Response System Condition (DORSCON) framework is a colour-coded alert, risk assessment and response action protocol which comes into action as soon there is an outbreak. It was the promptness by this framework that Singapore did not require a suppression strategy and were able to successfully control the pandemic at stage 2 level itself.

Italy, conceding the worst hit so far: what went wrong?

As mentioned above, China, South Korea and Singapore were able to efficiently implement their personalised containment measures which could have reduced number of deaths by thousands at least if not tens of thousands. Italy’s health infrastructure is otherwise quite impressive with 3.2 hospital beds per 1,000 people in contrast 2.9 in the United Kingdom.

Initially, Italy did respond promptly and efficiently to COVID-19 pandemic, but its national health capacity system soon got saturated. Within the first three weeks of 1st COVID-19 case detection in Italy, patients flooded the hospitals, occupied the ICU beds and ventilators clogging the healthcare resources (54). The most inflicted regions are in northern Italy (Figure 2). The northern regions like Lombardia (22,264 total COVID-19 cases), Emilia-Romagna (5,968 total COVID-19 cases) and Veneto (4,031 total COVID-19 cases) have so far seen the most cases and deaths, where overloaded hospitals are groaning to cope (55,56).

Figure 2 Heat map of COVID-19 burden in Italy in various regions with breakdown of cases based on gender and age group.

Italy’s death toll is skyrocketing since then and even surpassed China’s numbers on 19th March 2020 (56). Rosenbaum et al. in his recent report discussed Italy’s ground situations at all fronts of Ethics, Logistics, and Therapeutics (57). Grasselli et al. from University of Milan, Italy in their report outlined in detail the actions taken by an emergency task force set up by the Government of Lombardy, Italy in association with local health authorities on 21st February 2020, when a cluster of 16 cases were reported (58). A team of 15 first-responder hub hospitals were allocated for their expertise in infectious disease or because they were under part of the Venous-Venous ECMO Respiratory Failure Network (RESPIRA). Extra ICU beds were created to accommodate the sick patients. However, despite the best efforts, most of the hospitals got overwhelmed and ran out of their maximum capacity to handle the critical patients. A health resource and service assessment were done by the end of two weeks (dated 7th March 2020) which revealed a huge inequality between the formulation and actuality faced by Italy (47,59). As per Grasselli et al.’s report, the patient sickness profiles and health resource mobilisation for what Italy prepared itself was based on that data from China and Singapore experiences that witnessed approximately 5% ICU admission rate amongst the COVID-19 hospitalised patients (58). In contrast, when COVID-19 pandemic hit Italy, it was found that there were approximately 12% of the total COVID-19 cases, and 16% of all hospitalized patients who required ICU admissions. These ICU admission numbers were actually 2–3 times of what Italy anticipated while formulating its taskforce. Considering the collapsing intensive care infrastructure of almost all the hospitals, on 6th March 2020, The Italian College of Anesthesia, Analgesia, Resuscitation and Intensive Care (SIAARTI) issued a modification of triage protocol and clinical ethics recommendations to guide Italian physicians for COVID-19 pandemic: “For the allocation of intensive care treatments, in exceptional, resource-limited circumstances” (60). At present, desperate attempts are being taken with both non-pharmacological and pharmacological interventions, including lockdown of the whole Italy in order to bring an immediate halt to the community transmission.

Possible reasons for demographical variation of COVID-19 amongst Asian, European, American continent

As COVID-19 is evolving across the globe, we are noticing variations in the infection rate, mortality, worst hit age group, disease response and so on (Table 2) (23,61-69). Initial reports from China suggested a median basic reproduction number (R0) of 2.79, however R0 have been reported as high as 5.7 (70,71). Deshwal et al. accumulated a 7-day data for all the new COVID-19 cases did a comparative study comparative study of Asian, European, and American continental countries (72).

Table 2
Table 2 Geographical variation in the mortality reported as mentioned in various recently conducted studies
Full table

Amongst the Asian countries, COVID-19 incidence in China has remained almost constant for almost last few weeks. Cases in other Asian countries like India are on rising trend with evidence of community transmission. Italy, Spain, France, United Kingdom and Netherlands are the worst hit European countries. As per the report by Deshwal et al., ratio of confirmed cases, death cases and death rate per 1,000 confirmed cased were highest in North American countries and lowest in Asian countries (72).

There are multiple reasons which we could count on for variation in COVID-19 epidemiology; (I) community immunity; (II) travel and connectivity across the borders; (III) population density; (IV) social class disparities; (V) percentage of elderly population and so on. For instance, amongst the European nations, Italy has the oldest population, with approximately 23% of its citizens more than 65 years which probably was one of the major reasons for highest morality noted in Italy (73). Contrary to this, India which has so far done fairly well despite being the second most populous nation has more than 50% and 65% of its population below 25 years and below the age of 35 years respectively.

Another important factor that needs discussion is the variation in the differing strategies used for SARS-CoV-2 RT-PCR testing. This could be another potential factor for difference in country-specific case-fatality rates. For example, Korea adopted the strategy of liberal testing for SARS-CoV-2, that way many patients with milder disease or symptomatic disease were included in the denominator (74). In contrast, Italy prioritized testing for patients with more severe symptoms. This could be another reason for a higher case-fatality rate in Italy as compared with Korea (7.2% vs. 1.0%). In United States, there is huge variation amongst the variation states as every state is following its own protocol as there is no declaration of nationwide lockdown (75).

Management strategies

Non-pharmaceutical interventions (NPIs)

Unfortunately, unlike many other diseases, we still are still away from the target antiviral drug and vaccine for SARS-CoV-2 infection. The prime importance of NPIs like social distancing, staying in home, work from home, self-monitoring, public awareness, self-quarantine etc. are constantly being emphasized by CDC, WHO, health ministries of all countries and social media houses (Figure 3). As SARS-CoV-2 infection can easily be transmitted through respiratory droplets and direct contact, the best way to halt the community transmission is to follow the civic etiquettes and social distancing. Neil M Ferguson and colleagues from Imperial College London recently submitted their report on the behalf of Imperial College COVID-19 Response Team (76). They studied the epidemiological modelling microsimulation model on COVID-19 for two countries: the UK (Great Britain specifically) and the US and they also suggested NPIs in their conclusion.

Figure 3 Pictorial representation of the expected non-pharmacological interventions and decisive actions required by the administration to stop COVID-19.

Pharmacological interventions: newer strategies and developments

Supportive therapy

Currently, Physicians across the world are testing for COVID with RTPCR testing for patients presenting with respiratory symptoms. It is particularly important to recognise the importance of keeping in mind the other local endemic disease like malaria, dengue, and so on (77). Similarly, the common cardiopulmonary diseases like congestive heart failure, community acquired pneumonia, pulmonary thromboembolism, COPD asthma exacerbation are few of the common differentials that need simultaneous testing and exclusion (78).

Once confirmed, the standard of care of the treatment of COVID-19 struck patients involves supportive care that includes adequate oxygenation, blood pressure support, and if needed the life support systems like invasive ventilation, Extracorporeal membrane oxygenations (ECMOs) and renal replacement therapy as needed. There is no approved antiviral drug for COVID-19. Worldwide, in a desperate attempt to save lives, doctors have been trying conventional antiviral agents like oseltamivir, lopinavir/ritonavir combination with variable results. Cao et al. studied effectiveness of Lopinavir–Ritonavir drug combination and randomised their 199 COVID-19 patients to the lopinavir–ritonavir group (99 patients) versus standard-care group (100 patients) (79). They did not find any benefit of using lopinavir–ritonavir over standard care with regards to time to clinical improvement, duration of oxygen therapy, duration of hospitalization, and time from randomization to death. However, they did find a shorter ICU stay (median, 6 vs. 11 days), a shorter hospital stay from date of randomisation (median, 12 vs. 14 days), and a higher percentage of clinical improvement at day 14 (45.5% vs. 30.0%) in the lopinavir–ritonavir group than in the standard-care group. However, all these benefits were non-significant between the two groups.

Newer antiviral agents

Recently National Medical Products Administration of China, China approved first anti-viral drug, Favilavir against COVID-19 (80). Another drug, named remdesivir which is a nucleoside analogue and originally developed during the Ebola outbreak is being studied at Nebraska medical centre, Omaha for its effectiveness in COVID-19 (81).

Other drugs

Anti-malarial agent, hydroxychloroquine (HCQ), an analogue of chloroquine is also commonly used in rheumatoid arthritis, lupus, Q fever, and Whipple’s disease. It has recently gained limelight for its anecdotal reports of effectiveness in COVID-19 patients (82,83). Doing clinical trials on humans was based on the vitro studies that showed an anti-SARS-CoV activity for HCQ (84). Gautret et al. studied the effectiveness of combination of HCQ and azithromycin versus HCQ alone versus standard care (twenty patients in total). The dose used in this study was oral HCQ 200 mg three times a day for 10 days (83). The primary endpoint was to evaluate for virologic clearance at day-6 post-inclusion which showed a significant reduction of the viral carriage in the combination group than control group. The small patient number is the major limitation of the study but has given a good platform to work. The Food and Drug Administration (FDA) is currently investigating if HCQ can reduce the symptom duration, or “viral shedding”, which might be helpful in mitigating the disease spread (85). Recently, there has been conflicting reports on the use of cardiac medications like ACE inhibitors, ARB’s, and other RAAS antagonists on patients with COVID-19. For instance, Goldstein et al. suggested that use of ARB might facilitate the viral entry by increasing the expression of ACE 2 receptors. However, this needs confirmation by conducting larger studies (86-88).

Investigational vaccines

Development of vaccine is a tedious and time taking process. NIH has initiated a clinical trial at Kaiser Permanente Washington Health Research Institute (KPWHRI) in Seattle (89). This trial involves 45 volunteers who will be receiving an investigational vaccine (mRNA-1273), two sessions of injections over 28 days apart. These patients will be subsequently followed for vaccine’s potency. Unfortunately, the result will be available approximately after a year.

Revisiting old therapy: using convalescent serum for COVID-19 susceptible population

Immunologists at John Hopkins centre are working on setting up a lab which aims for using the concept of taking the serum from the patients who have recovered from COVID-19 disease and injecting them to the individuals who have high susceptibility to acquire infection, vulnerable population like old individuals, and health care providers who are always at high risk of acquiring the infection (90,91).


COVID-19 pandemic has already costed lives of more than 250,000 individuals, mostly elderly and fragile population. This is time of introspection and learning from our mistakes. Psychological wellness of front-line workers and rest of the healthcare team is another consideration that should not be ignored during these times (92-95), and countries like China and South Korea who were initially the most hit countries could contain the disease spread by liberal testing of their population, stringent quarantine of people under investigation and isolation of the positive cases. Rest of the countries need to act urgently as well to bring an immediate halt in the community transmission. Also, this is an evolving pandemic, the literature regarding therapeutics and strategies to monitor the trajectory are still evolving. Our manuscript highlights the importance of the above two point. This review, in no way is a complete guide to the management and public health policy but an overview.


Funding: None.


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Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at AL serves as an unpaid section editor for Annals of Translational Medicine from Nov 2019 to Oct 2021.The other authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. All authors have participated in the preparation of this manuscript and have approved the final version.

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Cite this article as: Sahu KK, Mishra AK, Lal A. Trajectory of the COVID-19 pandemic: chasing a moving target. Ann Transl Med 2020;8(11):694. doi: 10.21037/atm-20-2793