CDC Mỹ: Biến thể Delta và ảnh hưởng đến người tiêm vaccine COVID-19

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Ngày cập nhật gần nhất: 15/4/2026

Đọc tóm tắt

- CDC study shows Delta variant produces high viral loads in both vaccinated and unvaccinated individuals.
- Delta variant poses higher transmission risk, even in vaccinated individuals.
- Vaccination reduces risk of severe illness or death, but transmission risk remains high if infected.
- US health authorities issue new guidelines for COVID-19 prevention.
- Recommendations include wearing masks in public and enclosed spaces, regardless of vaccination status.
- Goal is to prevent disease spread and minimize infection risk from others.

The latest CDC study reveals that the Delta variant of the SARS-CoV-2 virus produces an equivalent amount of virus in both vaccinated and unvaccinated individuals against COVID-19.

High viral loads in vaccinated individuals who still contract the disease indicate that unlike other variants, the Delta variant poses a higher transmission risk. This raises concerns that vaccinated individuals infected with the Delta variant can still spread the disease to others. According to experts, vaccination helps reduce the risk of COVID-19 infection and minimizes the risk of severe illness or death if infected. However, if a vaccinated person still contracts the disease, the risk of transmission to others remains high, similar to unvaccinated individuals.

Do this, the US health authorities have issued new guidelines for COVID-19 prevention in the country. They recommend that regardless of vaccination status, people should wear masks in both public places and enclosed spaces, especially in areas with a high risk of disease transmission. This is to prevent the spread of the disease to others and minimize the risk of infection from those around you.

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According to CDC

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