Nasal influenza vaccines are now available in China. The vaccines are applicable to children from three to 17 years old as an alternative to the traditional ones that are injected into the body through needles and syringes.
The vaccines are a kind of nasal spray that causes no physical pain to people. Each nostril takes 0.1 milliliters of the vaccines, and the vaccination process takes less than one minute.
After entering the human body through the nasal cavity, they first draw an immune response from the mucosa and then cells and body fluid by activating lymphocytes, experts said.
However, the nasal influenza vaccines are not applicable to everyone. They're not recommended to people who are: allergic to eggs or Gentamicin sulfate, have immune deficiency or impaired immunity or are using immuno-suppressive agents, have acute illness or serious chronic disease or acute outbreak of chronic disease, have fever, diagnosed to have nasitis, or are patients of Leigh syndrome who are using Aspirin or medicines containing that substance.
Those who have taken other vaccines recently, including the COVID-19 vaccines, should wait at least 14 days before taking the influenza vaccines.