Most people welcomed the opportunity to get vaccinated against COVID-19, yet a non-trivial minority did not.

Vaccine-resistant people tend to hold strong views and assertively reject conventional medical or public health recommendations.

This is puzzling to many, and the issue has become a flashpoint in several countries.

It has resulted in strained relationships, even within families, and at a macro-level has threatened social cohesion, such as during the month-long protest on parliament grounds in Wellington, New Zealand.