Show flu vaccine limited influenza vaccine should houll be given in november in the northern areas or immediately after the first oc occurrence C ur ot of the disease according cordin g to the new york state department or of health duration of 0 the tha immunity given by the vaccine is short generally from about tour four months to a year the common cold and its om however are not prevented by the use of influenza vaccines nor Is protection afforded against n s t bacterial infections infection luch as ai streptococcal sore throat |