Vaccine programmes facing threat of 'donor fatigue'.
Spinney
L
L
D001500:BCG Vaccine; D002648:Child; D005653:Fund Raising; D006801:Humans; D017589:Immunization Programs / Q000191:economics*; D011054:Poliovirus Vaccine, Inactivated
D001500:BCG Vaccine; D011054:Poliovirus Vaccine, Inactivated