Vietnam: Elevated varicella activity reported in Hanoi through March

Event

Vietnamese health officials have reported more than 550 varicella cases in Hanoi since Jan. 1. This caseload is 138 times the four cases reported over a similar period in 2022. Chuong My (230 cases) has reported the highest disease activity, followed by Me Linh (69 cases), Ba Vi (60 cases), Nam Tu Liem (56 cases), and My Duc (42 cases). This represents the most complete information available as of March 24.

Context

Varicella is a very contagious disease caused by the varicella-zoster virus (VZV). The VZV is transmitted through contact with virus particles from blisters or respiratory droplets created when an infected individual coughs, sneezes, or speaks. Chickenpox is the result of a primary varicella infection. Symptoms typically appear 14-16 days after exposure but can develop up to 21 days after exposure. The first sign of chickenpox in children is usually a rash; adults usually experience fever and malaise before getting a rash. Recovery from chickenpox usually results in lifetime immunity against a second occurrence. However, since the VZV remains latent in nerves, it can become reactivated and cause a recurrent infection known as herpes zoster, or shingles.

Advice

Visit a doctor to ensure vaccination against varicella or immunity through previous infection. Practice basic health precautions. Call your medical provider if symptoms develop within three weeks of being in affected areas.