Translate the structures: the battle of epidemic prevention and control incidence rate asymptomatic Cartier

Clustered outbreak of COVID-19 refers to ( ) A: Two or more confirmed cases or asymptomatic infections within 7 days in a small area B: Two or more confirmed cases within 14 days in a small area C: Two or more confirmed cases or asymptomatic infections within 14 days in a small area D: Two or more confirmed cases within 21 days in a small area E: Two or more confirmed cases or asymptomatic infections within 21 days in a small area

Which statement about carrier is right? A: A person with asymptomatic infection that can be transmitted to other persons.<;br>; B: A person with symptomatic infection that can be transmitted to other persons.<;br style="white-space: normal;">;<;br>; C: A person with symptomatic infection that can`t be transmitted to other persons.<;br>; D: A person with asymptomatic infection that can`t be transmitted to other persons.<;br style="white-space: normal;">;<;br>;

Which one of the following is the most effective measure to control the transmission and prevalence of HIV/AIDS? A: Control the source of infection, and adopt centralized management of diagnosed AIDS patients and asymptomatic carriers of HIV B: Cut off the transmissions, such as prohibiting drug abuses and sexual promiscuities, block mother-to-infant transmission and check blood products rigorously C: Forbid HIV-infected people getting married D: Inject HIV vaccine E: Treat HIV patients