There do not exist any good vaccines. I challenge you to define what a good vaccine is without invoking the unproven imagined witchcraft of “viruses”. It’s all based on pseudoscience and the lowest standards of verification eliminate it as having any value as a field.

There are bacterial infections that are proven using Koch’s Postulates (the last one being Tuberculosis by Robert Koch himself in 1890). There are vaccines for TB but no proof that they are needed or whether they do more harm than good (spoiler - all vaccines cause far more harm than good under any standard of verification)

There might be a case that virology is a field one day worth studying but there’s no evidence ever of a contagious virus in the way modern virology wevisions it with a vaccine as a solution. Not polio, not HIV, not Covid - all of it is made up - even the Spanish Flu.

All the human subjects of the last century have yielded no progress because they don’t actually look for a contagious disease - they see a bunch of people getting sick for unknown reasons and assume it’s a contagious disease. Never proven (since TB).