Could all diseases have been airborne at some point in time?

Masquerade13

I thought about it after seeing a zombie movie- basically how did the 1st cases of diseases infect people or animals? I want to make sure it isn't possible that before diseases were specifically airborne or contact-based, could they all have been airborne, then evolved into their now present-day counterparts?

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mkh9

I haven't seen anything to suggest that this is the case. Anywhere. I do get that things evolve, however, usually viruses, bacteria and parasites usually have a pretty defined pathway. They haven't ever changed their mode of transmission.
mkh9

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CurfewX

No, of course not. For example, HIV and Hepatitis B/C have always been blood-borne.

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I cut myself deeply when cutting and preparing raw bloody beef am I in danger?

SmokinJoe78

I cut myself and punctured deeply the tip of my finger when cutting and slicing raw bloody steak. I quick ran the finger under hot water...

Bullfrog blood splashes into eyes

jjball5

I am a college student in China.On October 24th, I dissected a frog in the laboratory (not sure whether it was a bullfrog or a frog). At...

Infection from offal organ blood?

Seekingpeas

I ordered lamb liver and package is generally vaccum packed. I kept this liver package on my kitchen slab and then took took to other are...

Can I get rabies from Mink oil getting into a wound?

Noname78

Hi. I'd like to know, could you get rabies from mink oil? I was fixing a camera I had been previously oiling the leathers with some mink ...

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