Epidemiological and clinical characteristics associated with SARS-CoV-2 positivity in Burkina Faso: a retrospective hospital-based study during the first year of the COVID- 19 pandemic
This retrospective hospital-based study in Burkina Faso analyzed 2,463 suspected cases during the first year of the pandemic, revealing a 37.6% positivity rate and identifying anosmia, ageusia, cough, headache, and asthenia as key clinical predictors of SARS-CoV-2 infection, particularly among urban residents aged 30–44.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
When a new virus begins to spread across the globe, public health officials face a difficult challenge: how to recognize it quickly when the symptoms look like many other common illnesses. In the early days of the pandemic, most of what was known about the disease came from wealthy nations with advanced laboratories and extensive testing systems. However, the reality of how the virus behaved in different parts of the world, particularly in regions with fewer medical resources, remained a mystery. Understanding these differences is vital because the strategies used to detect and stop an outbreak depend entirely on knowing who is getting sick, where they are, and what specific signs they show. Without this local knowledge, health workers might miss cases or waste limited testing supplies on people who are unlikely to be infected.
Researchers in Burkina Faso set out to fill this gap by looking closely at the first year of the pandemic in their country. They focused on a large regional hospital in the city of Bobo-Dioulasso, which served as a central hub for testing people suspected of having the virus. Between May 2020 and May 2021, the team reviewed the records of nearly 2,500 individuals who had been sent for testing because they showed signs of respiratory illness. By comparing the medical histories and symptoms of those who tested positive against those who tested negative, the scientists aimed to identify the specific patterns that could help doctors in resource-limited settings make better guesses about who was carrying the virus.
The study revealed that the virus was not spreading evenly across the population. Of the people tested, more than one-third were confirmed to have the infection. These confirmed cases were overwhelmingly concentrated in urban areas, with the vast majority living in cities rather than rural villages. The virus appeared most frequently in working-age adults, specifically those between the ages of 30 and 44, who made up the largest group of infected individuals. While older adults were also affected, the data showed that the virus was most active among people in the prime of their working lives, likely due to their higher levels of movement and social interaction in busy city environments.
When the researchers examined the symptoms that brought people to the hospital, they found a mix of common complaints. Cough, headache, extreme tiredness, and fever were the most frequently reported issues among those who tested positive. However, these symptoms are also very common in many other respiratory infections, making them difficult to use as a reliable way to single out the virus on their own. The study found that while these general symptoms were present, they did not provide a clear enough picture to distinguish the virus from other illnesses with certainty.
The most significant discovery, however, was found in the senses of smell and taste. The researchers found that people who reported losing their sense of smell or their sense of taste were far more likely to be carrying the virus than those who did not. In fact, the loss of smell was the strongest indicator of all; individuals who experienced this symptom were more than twice as likely to test positive compared to those who did not. Similarly, the loss of taste was a powerful signal, strongly linked to a confirmed infection. These specific sensory changes stood out clearly against the background of more generic symptoms like fever or body aches, which did not show a strong enough connection to the virus to be considered reliable indicators on their own.
The study also looked at whether having certain long-term health conditions, such as diabetes or heart disease, made a person more likely to test positive. While people with these conditions were slightly more common in the group of confirmed cases, the analysis showed that these conditions did not significantly increase the odds of testing positive when compared to other factors. This suggests that in the context of initial detection, the presence of chronic illness was not the primary driver of who got infected, at least among the people seeking hospital care. Furthermore, the data showed that people who reported wearing face masks were actually slightly more likely to test positive than those who did not, but the researchers explained that this was likely because people who were already sick or worried about the virus were the ones most diligent about wearing masks, rather than the masks failing to work.
Ultimately, this research provides a clear map of how the virus presented itself in a specific African context during its first year. It confirms that the virus thrived in cities and among working-age adults, but it offers a more practical tool for doctors: the loss of smell and taste. In a setting where testing capacity is limited and every test counts, these specific sensory symptoms offer a way to prioritize who should be tested first. By focusing on these distinct signs, health workers can better identify the virus early, even without immediate access to advanced laboratory equipment, helping to slow the spread of the disease in communities where resources are scarce.
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