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Scientists predict Covid-19 will become seasonal virus once herd immunity is attained

Hadi Yassine, of Qatar University in Doha, affirms and states that there could be multiple waves of Covid-19 before herd immunity is achieved.

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Italy Covid-19 toll rises above 4,000, Spain's crosses 1,000Beirut, Sep 15 (IANS) We are all too familiar with the seasonal patterns of some respiratory viruses and now scientists suggest that Covid-19, the illness caused by the SARS-CoV-2 virus, will likely follow suit and become seasonal in countries with temperate climates, but only when herd immunity is attained.

Until that time, Covid-19 will continue to circulate across the seasons. These conclusions published in the journal Frontiers in Public Health, highlight the absolute importance of public health measures needed just now to control the virus.

“Covid-19 is here to stay and it will continue to cause outbreaks year-round until herd immunity is achieved,” said study researcher Hassan Zaraket from the American University of Beirut in Lebanon.

Therefore, the public will need to learn to live with it and continue practising the best prevention measures, including wearing of masks, physical distancing, hand hygiene and avoidance of gatherings.” Zaraket added.

Collaborating author Hadi Yassine, of Qatar University in Doha, affirms and states that there could be multiple waves of Covid-19 before herd immunity is achieved.

“We know that many respiratory viruses follow seasonal patterns, especially in temperate regions,” Yassine said.

For instance, influenza and several types of coronaviruses that cause the common cold are known to peak in winter in temperate regions but circulate year-round in tropical regions.

The authors reviewed these seasonal viruses, examining the viral and host factors that control their seasonality as well as the latest knowledge on the stability and transmission of SARS-CoV-2.

The researchers explain that virus survival in the air and on surfaces, people’s susceptibility to infections and human behaviours, such as indoor crowding, differ across the seasons due to changes in temperature and humidity.

These factors influence the transmission of respiratory viruses at different times of the year. However, in comparison to other respiratory viruses such as the flu, Covid-19 has a higher rate of transmission (R0), at least partly due to circulation in a largely immunologically naive population.

This means that unlike the flu and other respiratory viruses, the factors governing seasonality of viruses cannot yet halt the spread of Covid-19 in the summer months.But, once herd immunity is attained through natural infections and vaccinations, the R0 should drop substantially, making the virus more susceptible to seasonal factors.

“Whether our predictions hold true or not remains to be seen in the future. But we think it’s highly likely, given what we know so far, Covid-19 will eventually become seasonal, like other coronaviruses,” Zaraket noted.

Source: IANS

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