Physics covers a wide range of phenomena, from elementary particles (such as quarks, neutrinos, and electrons) to the largest superclusters of galaxies. Included in these phenomena are the most basic objects composing all other things. Therefore, physics is sometimes called the  fundamental science .
Two types of influenza vaccines are available: 1  TIV (flu shot (injection) of trivalent (three strains; usually A/H1N1, A/H3N2, and B) inactivated (killed) vaccine) or. 2  LAIV (nasal spray (mist) of live attenuated influenza vaccine.)
The CDC recommends that children who are getting the flu vaccine for the first time receive two doses of the vaccine (either the nasal spray or the flu shot). Children who have previously been vaccinated need just one dose, according to the CDC. Follow Rachael Rettner @RachaelRettner.