The thread title references a non-fiction book:
It is an account of a radioman’s time abord a WW1 era merchant ship.
At one point the crew contracts “Blackwater fever”. The symptoms are black urine, high fever, and deep comas simulating death. Most of the crew end up recovering, and it is a bit chilling that one (two? been 10+ years since I read it) are buried at sea before they realize that most of the patients are not quite dead.
IIRC the entire crew is eventually afflicted, so it must have been very contagious. They picked it up in a port, (North Africa?)and I think they may have been warned off by a harbor pilot before any actually went ashore.
I also seem to recall that some of the crew had milder relapses of the infection for some months after initial recovery.
Do any of our doper docs want to hazard a guess as to what disease this might have been?
I’ll pull out the book tonight and see if I can add any info, or correct errors in my memory.