A new flu vaccine is available to prevent people from spreading the virus at home, but it comes with an added risk.
The new flu shot contains a “strong” component that can potentially be transferred from someone else to the vaccinated person, which could make it hard to be sure the shot is fully effective.
A report released Wednesday by the National Institutes of Health and the U.S. Centers for Disease Control and Prevention found that a person who was vaccinated with the new flu vaccination had about one-fifth as much risk of getting the flu as a person vaccinated with a placebo.
The report said the risk of transmitting the flu was roughly one-quarter as great for people who received the vaccine with the strongest component of the vaccine.
It also said that the vaccine could make some people more vulnerable to infection, especially if they were exposed to an infected person while traveling abroad.
The study was based on more than 1,500 people who were vaccinated in more than 100 countries in four months of the pandemic.
It was released on the heels of a warning that some people may not be fully vaccinated against the coronavirus, which is spread through the air.
The virus is spread by the droplets of the respiratory secretions of infected people.
The researchers said that if the vaccine does not completely protect against the virus, then there is a greater risk of spreading it to others.
The vaccine, called OTC-H3N2, was first approved in Europe in 2012.
It is designed to target the virus’s most contagious variant, called CNV-19, and contains the stronger version of the component, which has been found to be less contagious.
The CDC says about a third of the population in the U