| serological surveillance of influenza in hamburg and munich (1976/1977). | a monthly serological survey (hi-test) of influenza infections was done in hamburg (1083 sera) and munich (955 sera) between june 1976-february 1977 in order to find out if environment influences the host's response to infection. a higher frequency of seropositive reactions and percentage of protective antibodies (titer 1:40 and over) was found in the population of hamburg versus munich. the frequency was greater in individuals over 60 years (group iv) followed by persons 25-29 years (group iii) ... | 1977 | 604125 |