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In the early 20th-century, they were viewed as a "miracle of science". but now at the beginning of the 21st-century, they have become very controversial.

Respuesta :

Approximately 400 Canadians each year acquired polio in the country sixty years ago. Those who lived had their nerve systems disabled and their limbs permanently amputated.

Thanks to systematic vaccines against it and 12 other potentially fatal conditions, polio has been eradicated in Canada and is now only endemic in a small number of other countries.

Routine immunizations, or vaccinations, are regarded as the world’s most crucial barrier against preventable diseases, along with flush toilets and clean water.

Surprisingly, infectious diseases like measles and pertussis (commonly known as whooping cough) are becoming more prevalent despite the fact that immunizations are free and widely accessible in Canada.

A fragmented national approach, parental apathy and reluctance, pervasive disinformation, socioeconomic circumstances, cultural misunderstandings, and declining childhood immunization rates in Canada are to blame for the revival.

To know more about vaccines, visit:

https://brainly.com/question/6683555

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