Marla Ahlgrimm explains that many health experts believe late fall and early winter may trigger an uptick in COVID-19 cases. It is almost impossible, however, to accurately predict how a novel virus will react from one season to the next. What we do know is that warm weather was not the savior we all expected.
Marla Ahlgrimm explains further that large crowds, such as unsanctioned gatherings and protests, may usher in localized epidemics.
The World Health Organization and other agencies do not have an official definition of what, exactly, defines a second, or even third, wave. Most experts, such as Marla Ahlgrimm, say that it is up to experience, speculation, and interpretation. What is accepted universally is that a second wave really just means an increase in disease transmission after a noticeable decline.
Marla Ahlgrimm compares the coronavirus to the 1918 flu pandemic. At that time, there were three major periods of infection: spring, fall, and winter. This is likely to happen with the coronavirus, with each wave being triggered as people become more and more comfortable living in a world with this new health threat.