Even though the virus in<unk>  is<unk>  (low in virulence), it is still a living virus, and may cause an infection with complications in people with weakened immune systems or other underlying medical conditions.<unk>  is recommended only for people 2–49 years of age, and people who have a weakened immune system, pregnant women, and people with certain chronic diseases may not be eligible to receive<unk> . In contrast, inactivated virus vaccines contain no living virus, and cannot cause a<unk>  infection. Persons receiving<unk>  may shed small amounts of the vaccine virus during the first week. People coming in contact with the vaccinated person are not considered to be at risk, unless their immune systems are severely weakened (for example, bone marrow transplant recipients) and possible recombination with other (wild or<unk>  vaccine) flu strains.
Live attenuated influenza vaccine
Adenovirus vaccine
Universal coronavirus vaccine
Hantavirus vaccine
Respiratory syncytial virus vaccine
Universal flu vaccine
Measles vaccine
Rotavirus vaccine