Type O blood is universal, the type most blood banks prefer, but according to a WLNS Channel 6 report Type O may also be the preferred type for Mosquitos too.   The study sited by Smithsonian.com found that mosquitos preferred to land on type O people almost twice as often as those with type A.  Do you know your blood type?  the Color you are wearing, women who are pregnant, those who are working out and people who have been drinking beer are also mosquito favorites.