Ngoc Tram, 55, from Dong Nai, asks: "I heard banaba leaves contain substances that reduce blood sugar and fat. I have type 2 diabetes; can I pick leaves and boil water to drink daily?"

What began as common flu symptoms quickly escalated, leading a 10-year-old girl into cardiovascular collapse from fulminant myocarditis.

I have received flu vaccinations for two consecutive years and found them effective in preventing the flu. Next week, I have an appointment for a booster shot; will this overload my immune system? (Thien An, 30, Phu Tho)

Waiting for a flu outbreak to get vaccinated means the vaccine may not have enough time to build protective antibodies, leaving individuals susceptible to illness and severe complications.