Nothing changed since the 1950s, however. There was a poliomyelitis outbreak in Oman in 1988-1989, despite the 87% vaccination coverage. No association between the number of vaccine doses and paralysis was found. However, a lot more children who received a DTP vaccine within past 30 days got sick. 25% of children got sick because of the DTP vaccine. In 1993, 89% of 152 children suffering from paralytic poliomyelitis received an unnecessary injection 48 hours prior to the onset of paralysis. Almost always the paralysis developed at the injection site. Other studies in Pakistan showed a similar pattern. The same was observed in India.