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poliomyelitis from antecedent injections with DTP 1950s and 1960s. The classical definition of vaccine, and participation of fully vaccinated children in poliomyelitis is "a disease with residual paralysis which the chain of transmission... A total of four laboratory- resolves within 60 days"; the new definition is "a disease proven cases occurred in 1991. The first two cases __ with residual paralysis persisting for more than 60 occurred in the Batinah region in March 1991 (44- and days". Since only less than one per cent of the cases 49-months-old children), both of whom received four _ develop a residual paralysis persisting for more than 60 doses of OPV. Two additional cases (25 and 30 months days, the new definition "eradicated" the vast majority of old), all after 5 doses of OPV, occurred in August and cases in which paralysis resolved within 60 days as not October 1991 in adjoining Eastern and Interior regions. being poliomyelitis. Strebel et al. (1994) wrote: "Cases The same genotype of wild type 3 poliovirus was are confirmed if they meet the following definition: an isolated in all of them." They concluded that the acute illness characterized by flaccid paralysis which is experience in Oman ; ; 7 _ compatible with the indicates that uniform | Pertussis and poliomyelitis morbidity (US) 1951-1987 | Clinical presentation of implementation of the poliomyelitis in the acute — Partussis per 10,000 ‘ present WHO strategy "may e phase and_ residual ——Paralytic poliomyelitis per 100,000 not be sufficient to | 4qq.000 neurologic deficit 60 days interrupt transmission" and (or later) after the onset of that several additional paralysis.” doses of OPV to all children may be needed. Additionally, cases were defined as "“vaccine- (Obviously, no doses would 10.000 associated" if there was no do the trick.) direct evidence of wild poliovirus infection and if Paralytic poliomyelitis there was a positive history of recent exposure outbreaks in Romania 1.000 to oral poliovirus vaccine. According to Strebel et al. This definition is (1994), although interesting in that it poliomyelitis due to wild highlights the fact that virus infection had virtually 0.100 vaccine-caused paralysis disappeared from Romania, acquired very high with no cases having been significance. Just in case documented between 1984 someone may think that and 1989, vaccine- vaccination eradicated the associated paralytic 0.040 wild poliovirus in the poliomyelitis was reported environment (as claimed at very high rates for over by the vaccinators), note two decades. In November that natural infections 1990, to decrease the risk of with wild poliovirus vaccine-associated alee ZRERQEEMEPEES resulted in the paralytic poliomyelitis, oral aa anana aa ag mm w development of natura poliovirus vaccine immunity withou produced in Romania was replaced by imported oral paralysis. The outbreaks of paralysis were directly vaccine produced by a Western European manufacturer. connected with the mass administration of a variety o' The overall risk of vaccine-associated paralysis in vaccines, starting with smallpox and continuing with Romania was 14 times higher than the "reported" riskin _ diphtheria, tetanus and, especially after World War II, al the USA. However, the risks of recipient vaccine- the other vaccines. A great number of articles have associated paralysis relating to the first dose of oral been published about "provocation poliomyelitis", vaccine were similar for the Romanian and imported meaning "provoked by prior injections with a variety o vaccines. vaccines". The word "reported" is crucial due to a chronic Even in the case of Romania, Strebel et al. (1995) wrote endemic underreporting of any "vaccine-preventable about intramuscular (IM) injections within 30 days o diseases" after the introduction of mass vaccination, immunisation with oral poliovirus vaccines as a risk which consequently seemingly improves the efficacy factor for vaccine-associated paralysis. They wrote: "In and masks the real risk. All this is further compounded Romania the rate of vaccine-associated paralytic by a new definition of the disease poliomyelitis | poliomyelitis is for unexplained reasons 5 to 17 times introduced after mass vaccinations were started in the _ higher than in other countries. Long ago it was noted experience in Oman indicates that uniform implementation of the RE WITT at —Partussis per 10,000 ——Paralytic poliomyelitis per 100,000 28 « NEXUS Paralytic poliomyelitis OCTOBER - NOVEMBER 2009 www.nexusmagazine.com