Fear mongering.
Bacteria are everywhere
The reason we have more diseases is because of the excessive use of antibiotic, disinfecting and cleaning agents, giving rise to "superbugs". Focus on raising children with strong immune systems and sound nutrition. Grow food in a sustainable regenerative way. The soil, animal and human microbiomes will balance themselves. Of course we will have the occasional person with a congenitally weak immune system. Work on fixing the genetics of that if possible. Don't amplify the consequences of bacteria on those people and don't subject the majority to draconian, unsustainable sterility and cleanliness standards.