Các câu ví dụ cho từ variants

1. This variant, making its first appearance in Vietnam, contains two key mutations called E484Q and L452R, which have been found separately in other variants but not together in a single strain.

2. Le Quoc Hung, head of the Tropical Diseases Department of HCMC’s Cho Ray Hospital, said the presence of multiple outbreaks and variants at the same time means these are independent of each other and have come from different sources.

3. The recently observed variants would increase infection risks and incubation periods so they could go from one person to another in a shorter time frame," he said.

4. While isolation and lockdowns might be very effective against local outbreaks, multiple variants and infection sources mean the virus has spread on a much wider scale, requiring much greater containment efforts, he added.