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What is vaccine-derived polio, and what are the available vaccines against poliovirus?

The story so far: A two-year-old child in Tikrikilla, Meghalaya has been infected with vaccine-derived polio. Vaccine-derived polio is a rare condition that occurs when the weakened strain of poliovirus used in the oral polio vaccine mutates and regains the ability to cause paralysis. More about polio vaccines The first successful polio vaccine for poliovirus was made by Jonas Salk, …

Health Talk | Understanding vaccine-derived polio and its implications

Last week, a two-and-a-half-year-old child in Meghalaya’s West Garo Hills tested positive for poliomyelitis, commonly known as polio. Vaccine-derived poliovirus is a strain of poliovirus that has mutated from the strain originally contained in oral polio vaccines. However, the reporting of vaccine-derived cases does not indicate the return of wild polio, which was officially eradicated in India in 2014, as …

Meghalaya’s polio case derived from vaccine: Officials

New Delhi: The case of polio confirmed in a child from West Garo Hills in Meghalaya on Tuesday involves what is termed vaccine-derived polio, which is not uncommon, confirmed an official from the Union ministry of health and family welfare on Wednesday. “It is a case of vaccine derived polio that has been detected in a 2.5 years old child …

At its worst, polio causes paralysis: 'Polio Paul' Alexander had to spend 70 years in an iron lung after surviving the disease as a child. There are two types of polio present in the world today: Wild poliovirus and vaccine-derived poliovirus. Although vaccine-derived polio can take the form of any of the three types, type 1 is the only remaining …

In 1988, the World Health Assembly declared WHO’s commitment to global eradication of polio by 2000. Though the last case of type 2 wild poliovirus was reported in October 1999 from India, more than 90% of vaccine-derived poliovirus outbreaks are due to type 2 virus present in oral polio vaccines. Yet, the number of vaccine-derived type 2 poliovirus outbreaks have …

A type of poliovirus derived from vaccines has been detected in London sewage samples, the World Health Organization and British health officials said on Wednesday, adding that more analysis was underway. “It is important to note that the virus has been isolated from environmental samples only,” it said, stressing that “no associated cases of paralysis have been detected.” But it …

The recent news of wild poliovirus type 1 in Malawi imported from Pakistan and of polio outbreak in Israel caused by ‘circulating vaccine-derived poliovirus type 3’ are visible signs of floundering polio eradication. India conducts one annual national and two sub-national pulse immunisation campaigns with bivalent OPV for all children below five years, in addition to routine immunisation with five …