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Distributed via the CDC Health Alert Network
June 2, 2014, 16:00 (4:00 PM ET)
On 5 May 2014, the Director-General of the World Health Organization (WHO) accepted the recommendations of an Emergency Committee, declaring the international spread of polio to be a public health emergency of international concern (PHEIC) under the authority of the International Health Regulations (IHR) (2005) and issued vaccination requirements for travelers in order to prevent further spread of the disease. IHR is an international agreement among countries to prevent, protect or control the international spread of disease. All countries have agreed to be bound by recommended activities under IHR.
The “temporary recommendations” in response to this PHEIC, the second ever to be issued under IHR, will be reviewed and possibly revised by WHO’s Emergency Committee in three months. The burden for enforcement of the polio vaccination requirements under this PHEIC declaration lies with polio-affected countries (termed “polio-infected” by WHO). At this time, the United States government is not expected to implement requirements for entry into the United States.
U.S. clinicians should be aware of possible new vaccination requirements for patients planning travel for greater than four weeks to countries with ongoing poliovirus transmission. The May 5 WHO statement names 10 such countries, three designated as “exporting wild poliovirus” (Cameroon, Pakistan and Syria [Syrian Arab Republic]) that should “ensure” recent (4 to 52 weeks before travel) polio boosters among all departing residents and long-term travelers (of more than 4 weeks), and an additional seven countries “infected with wild poliovirus” (Afghanistan, Equatorial Guinea, Ethiopia, Iraq, Israel, Somalia and Nigeria) that should “encourage” recent polio vaccination boosters among residents and long-term travelers.
At this time, CDC is not aware of what specific steps will be taken by these 10 countries to comply with the PHEIC declaration. U.S. citizens who plan to travel to any of the polio infected countries should have documentation of a polio booster in their yellow International Certificate of Vaccination in order to avoid delays in transit.
Currently 10 countries have active transmission of wild poliovirus (WPV) that could spread to other countries through international travel. From January through April 2014, months normally considered the low-transmission season for polio, the virus already has been carried to three countries: from Pakistan to Afghanistan, from Syria to Iraq, and from Cameroon to Equatorial Guinea. WHO considers this an “extraordinary event” and a public health risk to other countries. If the current spread of WPV continues, cases could multiply considerably as the high-transmission season has already begun. The consequences of further international spread are particularly acute today given that several countries with complex humanitarian emergencies or other major challenges are bordering the infected countries.
Because of the substantial progress of the polio eradication initiative in 2012–2013, and in order to harmonize CDC recommendations with WHO recommendations, CDC now recommends an adult inactivated poliovirus (IPV) booster dose for travelers to countries with active WPV circulation. Countries are considered to have active WPV circulation if they have ongoing endemic circulation, active polio outbreaks, or environmental evidence of active WPV circulation. Travelers working in health care settings, refugee camps, or other humanitarian aid settings in these countries may be at particular risk.
Domestic clinicians should provide the following information to their patients planning international travel to countries experiencing polio outbreaks/active transmission:
1. Travelers to polio-affected areas should receive polio vaccination or a booster polio vaccination prior to travel following the guidance at http://wwwnc.cdc.gov/travel/yellowbook/2014/chapter-3-infectious-diseases-related-to-travel/poliomyelitis.
2. Travelers also may be impacted by new WHO Polio Vaccination Recommendations in countries with ongoing poliovirus transmission:
Travelers to or from all 10 countries should be given a WHO/IHR International Certificate of Vaccination or Prophylaxis (http://www.who.int/ihr/ports_airports/icvp/en/) to record and serve as proof of their polio vaccination.
CDC routinely recommends that anyone planning travel to a polio-affected country be fully vaccinated against polio and that, in addition, adults should receive a one-time booster dose of polio vaccine. Because of the recent PHEIC declaration, anyone staying in any of the polio-affected countries for more than four (4) weeks may be required to have a polio booster shot within the 4 weeks to twelve months prior to departure from that country. This booster should be documented in the yellow International Certificate of Vaccination in order to avoid delays in transit or forced vaccination in country. Either oral poliovirus vaccine (OPV) or inactivated poliovirus vaccine (IPV) may be used for this booster, however only IPV is currently available in the United States.
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