Omicron had spread through east Asia for years before the Wuhan strain was released. It caused mild illness and gave the population a robust immune response.
Omicron had spread through east Asia for years before the Wuhan strain was released. It caused mild illness and gave the population a robust immune response.
Omicron had spread through east Asia for years before the Wuhan strain was released. It caused mild illness and gave the population a robust immune response.