Are asymptomatic infected individuals contagious?
Sep 13, 2022
Source: Cainiu Health
Dr. Jiang Weimin
Introduction
In general, asymptomatic infected individuals are also contagious. Although these people do not have symptoms and feel no discomfort, they carry the novel coronavirus in their bodies. When the virus is expelled from their bodies, it may be transmitted to others. Asymptomatic infected individuals should take proper protective measures and avoid contact with others to prevent spreading the virus.
In real life, certain diseases are highly contagious, yet some infected individuals may exhibit no symptoms whatsoever. A commonly encountered example is asymptomatic infection with the novel coronavirus—individuals who test positive for SARS-CoV-2 but remain entirely symptom-free. Do such asymptomatic individuals pose an infectious risk?
Are asymptomatic individuals infectious?
Yes, asymptomatic individuals are indeed infectious. Although they experience no symptoms or discomfort, they carry the novel coronavirus in their bodies. They can serve as sources of infection; when the virus is shed from their bodies—through respiratory droplets, aerosols, or other routes—it may be transmitted to others. Asymptomatic individuals must therefore adhere strictly to protective measures, including minimizing contact with others, to prevent onward transmission.
Moreover, asymptomatic infection is not exclusive to SARS-CoV-2; it may also occur with other pathogens. Asymptomatic carriers harbor pathogenic organisms without developing clinical illness themselves. For instance, a chef carrying bacteria on their hands could contaminate food, thereby causing illness in those who consume it. Similarly, individuals chronically infected with hepatitis B virus (HBV)—whether termed “HBV carriers” or “asymptomatic HBV-infected persons”—closely resemble asymptomatic SARS-CoV-2 carriers.
In daily life, infectious diseases can be prevented by interrupting transmission pathways. For asymptomatic individuals, it is advisable to avoid crowded, poorly ventilated spaces; protect susceptible populations by refraining from visiting densely populated venues; and maintain rigorous disinfection practices—including regular ventilation by opening windows. We hope this response has been helpful. Wishing you good health and happiness!
