Each country and territory using the trivalent oral polio vaccine (that protects against three types of the virus) should switch to the bivalent oral polio vaccine (that protects against two types of the virus) during the last two weeks of April next year, a group of experts has concluded. The Strategic Advisory Group of Experts on immunization (SAGE), which advises WHO, said that the 149 count...

OBJECTIVE To analyze the costs of vaccination regimens for introducing inactivated polio vaccine in routine immunization in Brazil. METHODS A cost analysis was conducted for vaccines in five vaccination regimens, including inactivated polio vaccine, compared with the oral polio vaccine-only regimen. The costs of the vaccines were estimated for routine use and for the "National Immunization Days...

In 1978 the Government of India decided to use oral polio vaccine (OPV) to control polio, occurring then at the average rate of 500 cases per day (2). The primary vaccination schedule was three doses in infancy. The prevailing popular belief (based on theory, not evidence) was that vaccine viruses would spread in the community, immunise unvaccinated children, induce high herd effect, and contro...

  In 1974, the World Health Organization (WHO) established the Expanded Program on Immunization (EPI) to ensure that all children have access to routinely recommended vaccines. Since then, global coverage with the four core vaccines (Bacille calmette guérin vaccine [for protection against tuberculosis], Diphtheria-tetanus-pertussis vaccine [DTP], Polio vaccine, and Measles vaccine) has increase...

We studied the interactions of hepatitis B vaccine with other vaccines used in the World Health Organization expanded programs of immunization. Three groups of Senegalese children were vaccinated with hepatitis B vaccine (HB) alone, diphtheria-tetanus-pertussis (DTP)-polio vaccine alone, or a combination of hepatitis B vaccine and DTP-polio vaccines simultaneously. The immune responses to HBsAg...

Poliomyelitis is an exclusively human disease that mainly affects children. Clinical features of poliomyelitis can be varied, from mild illness to the most severe paralysis, and factor why has different performances in individuals been proved strongly correlated with membrane protein CD155. The nervous system shows a special protecting phenomenon against invasion poliovirus, mechanism not very ...

Since the introduction of vaccines against polio in the mid 1950s (Inactivated polio vaccine (IPV)) and the earl 1960s (Oral polio vaccine (OPV)), the control of polio has been successful. However, vaccine associated paralytic disease, which is caused by reversion of OPV, remains an unsolved issue in the present. Even though OPV has ability to induce a high level of intestinal immunity, it may ...

A hexavalent vaccine containing diphtheria toxoid, tetanus toxoid, whole cell pertussis, Haemophilius influenza type B, hepatitis B and inactivated polio vaccine (IPV) may: (i) increase the efficiency of vaccination campaigns, (ii) reduce the number of injections thereby reducing needlestick injuries, and (iii) ensure better protection against pertussis as compared to vaccines containing acellu...

Poliovirus infects 100% of susceptible individuals and causes acute flaccid paralysis in one out of200 infections. Type 1 causes epidemic poliomyelitis; type 2 has been eradicated worldwide; and type 3 is close to being eradicated. In this region, the last case of wild poliovirus occurred in Peru in 1991. There are still two endemic countries: Afghanistan and Pakistan, but countries where there...

Evidence generated through research studies has guided programmatic actions and fine-tuned strategies for the Global Polio Eradication Initiative (GPEI). However, many gaps still persist in the understanding of a risk-free implementation of the polio endgame. Immediate concerns relate to the introduction of inactivated polio vaccine (IPV) and switch from trivalent oral polio vaccine (tOPV) to b...