I think he is taking home the bacilli of the bubonic plague as a present to our country.
But there are influences, as there are bacilli, which unconsciously we absorb.
The latter come in contact with the bacilli, and remain for some time attached to them.
Nearly all cocci are immotile, while the bacilli may or may not be.
Even a temperature of 70° C. is able to lessen the efficacy of the bacilli.
If the bacilli are aggregated into clumps, positive reaction.
The bacilli may lodge on toys or other articles from which the child gets them.
The bacilli are not the only ones who can be numbered in their billions.
They are animals; bacteria, bacilli, micrococci, and all their tribe are vegetables.
Their air did not contain the bacilli and germs and microbes of disease that fill our own air.