A startup says used tissues are safer than vaccinations. Should you trust it?

polyvalent vaccine <grin> - much the same as 'Triple Antigen' which used to combine diphtheria, tetanus and whooping cough vaccines.

I initially laughed at this - it's definitely a money making scam - but it has a hidden basis of truth. It's certainly not a lot different really from fecal/faecal transplants.