Covid-19 vs H3N2 influenza vs Malaria: How to differentiate between the three conditions?

Covid-19, H3N2 virus and malaria are three diseases that have overlapping symptoms. So, it can be confusing to differentiate between the three. Here's how you can differentiate between these diseases.
Covid vs Malaria vs H3N2
Covid-19 vs H3N2 influenza vs Malaria. Image courtesy: Adobe Stock
Dr Vijay Kumar Gurjar Updated: 24 Apr 2023, 01:54 pm IST
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Amid the surge in viral flu infections, it can be challenging to distinguish whether the fever and body aches experienced by individuals are caused by Covid-19, H3N2 influenza or mosquito-borne malaria. While Covid-19 is anticipated to be on the verge of turning endemic from the pandemic, the country recently witnessed a huge spike in the cases of Covid and H3N2 influenza as well. Once monsoon will hit the ground, malaria might season out to pose a surging risk in the days ahead. With malaria accounting for approximately 88 percent of all malaria cases in the South-East Asia region in 2019, according to a World Health Organization report, it has been an area of concern for the public health authorities in the country. However, there has been a decline in the number of malaria cases in recent years stated by the same report aids motivation in curbing the menace of malaria.

Despite the different modes of transmission, the primary symptoms of these illnesses are similar, starting with fever and body aches. However, closely monitoring the varying symptoms of these diseases, it will be beneficial to differentiate between Covid-19, H3N2 influenza and malaria.

Covid-19 Vs H3N2 influenza Vs Malaria

Here are the differences between the three health issues:

1. Transmission mode

Malaria is distinct from Covid-19 and H3N2 as it is not transmitted from one individual to another. This is because the Plasmodium parasite that causes malaria is spread via bites from infected female Anopheles mosquitoes. In contrast, the SARS-CoV-2 virus responsible for Covid-19 primarily spreads through respiratory droplets, while the H3N2 influenza virus can spread through both respiratory droplets and contact with contaminated surfaces.

malaria
How is malaria transmitted? Image Courtesy: Shutterstock

2. Symptoms

Besides some similar symptoms such as fever, headache and body ache, there is also a multitude of symptoms that differs significantly in the case of the three. With malaria, prominent symptoms include chills, muscle pain, nausea and vomiting among others, and if left untreated it can turn severe and debilitating resulting in complications such as anaemia, kidney failure, and cerebral malaria, which can be life-threatening. In the case of Covid-19 and H3N2 influenza, fever, cough, fatigue, sore throat and runny nose are the primary symptoms. However, Covid-19 also presents with additional symptoms such as loss of taste or smell and shortness of breath.

3. Incubation period

The duration of the incubation period plays a crucial role in distinguishing between these illnesses. Covid-19 symptoms usually manifest between 2 to 14 days following exposure, with an average incubation time of 5-6 days. In contrast, the H3N2 flu virus has an incubation period of 1-4 days, whereas the incubation period of malaria can extend from 7 days to multiple months.

4. Treatment methods

The modalities of treating Covid-19, malaria, and H3N2 influenza differ significantly owing to the distinct etiologies of these diseases. Malaria is typically treated with antimalarial medications alongside effective measures to contain mosquito spread. In contrast, Covid-19 necessitates a multi pronged approach including medication, supportive care, and vaccination. On the other hand, H3N2 influenza is managed using antiviral agents along with symptomatic treatment to alleviate fever, cough, and sore throat.

Covid 19
How are covid, H3N2 and malaria treated? Image courtesy: Shutterstock

5. Tests that determine the infection

Determining the kind of infection is responsible for similar symptoms from three different diseases, there are distinguished diagnostic tests available. The most commonly used method to detect malaria is the microscopic examination of blood smears, which is based on the detection of the malaria parasite in red blood cells. Alternatively, rapid diagnostic tests that detect malaria antigens in blood samples are widely used due to their ease of use and rapid turnaround time. The diagnosis of H3N2 influenza is typically made using antigen tests that detect the viral antigen in respiratory secretions, while PCR-based assays can provide more accurate results. In contrast, the diagnosis of Covid-19 relies heavily on PCR-based tests that detect viral RNA in respiratory secretions.

The last word

With the continuous emergence of fatal infections affecting numerous lives, discerning between Covid-19, H3N2 influenza and malaria can be challenging due to their overlapping symptoms. However, understanding the transmission modes, distinct symptoms, incubation periods, treatment methods and diagnostic tests can aid in identifying the infection. Most importantly, consulting a doctor the moment these symptoms persist for a certain period of time is essential.

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About the Author

Dr Vijay Kumar Gurjar is a senior consultant and Head of the Department of Geriatric Medicine at Primus Super Speciality Hospital, New Delhi. He is a competent medical professional with more than 12 years of experience in medical services - both clinical and non-clinical. ...Read More

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