There were great landmarks of discovery of germ infections and ways to fight them coming during this very period of time: Mid Civil War (1862), Louis Pasteur (a chemist from France) invented pasteurization; by the end of the war in 1865, the news and his writings told the world about germs living without air in canned and bottled beverages and foods.
In the clinical setting, the underlying germ of infection is not always clearly defined when patients present with pneumonia/ARDS and therapy needs to be initiated.
Each independent germ line infection event defines a novel ERV family, which may increase its copy number due to intracellular retrotransposition [ 1] or extracellularly via re-infection [ 2], and in the end each ERV infection results in a few to several hundred genomic copies [ 3].
A great number of distinct HERV families have been defined that each stem from germ line infections of distinct exogenous retroviruses.
Germ cell infections by exogenous retro-viruses occurred millions of years ago and led to the stable maintenance of human endogenous retroviruses (HERVs) into the human genome.
Even children as young as Year 1 showed awareness of person to person transmission and the idea that germs transmit infection.
They presumably arose from successful germ-line infection by foamy-like viruses, but when or how many times this might have occurred during the course of eutherian evolution is unknown.
LTR-bounded elements, endogenous retroviruses (ERVs) and LTR-retrotransposons, comprise around 8% of the human genome 1. Although, once in the germ-line, ERVs can re-infect the host and thus amplify their copies, all ERVs can eventually be traced back to distinct events of germ-line infection by exogenous retroviruses.
For example, if you say you fear germs or infection emanating from the pet require you to prohibit the pet's presence in the room, your parents may fear you have a greater problem than hiding candy in your room.
