COVID-19: No new community-acquired infections in 11 days

The country has also reported no new cases since the two COVID-19 patients returning from abroad were confirmed on April 24, the ministry said in its COVID-19 update.

The disease has spread to nearly 30 cities and provinces across the country, with 270 cases confirmed, of which 225 have been discharged from hospital after making a full recovery.

The remaining 45 cases are receiving treatment at 6 centrally- and locally-run heath facilities. Most of them are in stable health condition, with more than 10 having tested negative for the deadly virus.

However, that fact that five recovered cases have recently relapsed is causing public concern about the possibility of a high risk of the virus infection within the community.

The World Health Organization warned "there is no evidence yet that people who have had COVID-19 will not get a second infection."

In a scientific briefing published late last week, WHO cautioned against governments that are considering issuing so-called "immunity passports" to people who have had COVID-19, assuming they are safe to resume normal life.

Vietnamese epidemiologists are examining why recovered cases have tested positive for the virus again. Among the five relapse cases in Vietnam, one case was exposed to the virus again after having tested negative five times.

Doctors said after being discharged from hospital, recovered patients should self-isolate at home for 14 days for medical observation. Those who have symptoms like a cough or a high temperature should consult a doctor for coronavirus testing again.

People are still advised to strictly follow health recommendations, including wearing face masks, maintaining a safe distance and avoiding large gatherings when going out in public places, or washing hands with soap and water when returning home.