vaccination concept to stop an epidemic, with a syringe and serum

africa aids bacterium cancer care chickenpox concept contagious cure danger death diphtheria disease doctor epidemic epidemics eradicate fight flu fragile health hepatitis hospital hygiene illness immune immunize infirmary inject injection life measles medication medicine mortality mosquito needle nurse pandemic poliomyelitis population prevention protect protection public reimbursement risk save security serum sick social spread stop symbol syringe system tetanus transmission tuberculosis vaccinate vaccination vaccine virus