Lavoie and Dix said their recommended fall campaign will coincide with respiratory illness season, when airborne pathogens like COVID-19, the cold and flu tend to circulate more due to temperature, humidity and people gathering more closely indoors. But COVID-19 waves have not b...
A:"Stable" viruses that don't replicate quickly need fewer boosters, because there's lasting immunity. For instance, we need a tetanus shot only once every 10 years. Measles, smallpox and polio need one shot a lifetime. By contrast, both flu and COVID viruses replicate quickly. This mean...