I’ve been exposed to (a close contact of) someone with COVID
close 有多少种用法和意思?_百度知道
Close down
contact中文_contact是什么意思
Casual Friends VS Close Friends: What Are The 4 Levels of Friendship?
Risk factors for human infection with avian influenza A H5N1, Vietnam, 2004.
Rapid tests are designed to identify influenza A only, influenza A or B without identifying the type, or influenza A or B with type-specific identification.