What was the reason the doctors thought the Black Plague occurred?

Some thought it was a punishment from god or a religion thing. Some thought that people from other religions poisoned the water.

it may be touching on the issue of over sexualizing all women

the lachish letters were written by hoshaiah, a military officer stationed possibly in mareshah,   and sent to yaush, possibly the commanding officer at lachish.

the series of letters were written in carbon ink in ancient hebrew on clay ostraca, shortly before lachish fell to the babylonian army of king nebuchadnezzar in 588/6 bc during the reign of zedekiah, king of judah.