قالب وردپرس درنا توس
Home / Health / Two types of polio have disappeared, but the end of the disease is still far away

Two types of polio have disappeared, but the end of the disease is still far away



In another milestone on the long, expensive and sometimes daunting path to polio eradication, global health authorities announced on Wednesday that two of the three strains of the wild polio virus had been officially eliminated.

Although this brings the world of extinction a step closer, the effort has taken much longer than ever expected. When the campaign began in 1988, most health authorities and donors expected the fight to end by the year 2000.

However, two major obstacles came to light.

First, millions of families around the world have not given their children the drops because of persistent false rumors that the vaccine is a Western plan to sterilize or harm Muslim girls. Second, in some countries, viruses used in the oral vaccine itself have mutated into a form that can be passed on to diapers and wastewater and can paralyze unvaccinated children. This has contributed to the fear of the oral vaccine, although complete vaccination is the only protection against such mutant viruses.

Only in the last two months were cases of paralysis in the Philippines caused by mutant vaccine viruses, Zambia, Togo and Chad. Since paralysis only occurs in about one in 200 polio cases, experts believe that many more children were infected.

In order to stop such outbreaks, hundreds of thousands of children usually need to be vaccinated with both the injectable vaccine containing an unmutable virus and the oral vaccine. The latter contains debilitated viruses that normally do not cause disease, but offer better protection than killed viruses.

The strain, which this week was declared eliminated by the Global Certification Commission for poliovirus eradication, is the wild poliovirus type 3, the last case of which was seen in Nigeria in 2012. Type 2 was created in 2015 for eliminated explained; The last case was discovered in 1999 in India.

Type 1, the only remaining wild tribe, occurs only in Pakistan and Afghanistan.

(In the 1950s, the three tribes had more meaningful names: Brunhilde, Lansing and Leon. The first was named after a lab chimpanzee, the second named after the city of Michigan, where he was isolated, and the third after a deceased boy Los Angeles. The nicknames later fell into disgrace 19659002] Enormous, multi-year surveillance efforts are needed before a virus strain can be declared extinct Children can be affected by several other viruses, by bacterial brain infections as well as by neck and neck Spinal injuries are paralyzed.