Post Reply - CoViD in the 1980's ????

   DJ, The Netherlands had a very major Q-fever outbreak around 20 years ago...
https://www.omroepbrabant.nl/nieuws/4644769/veel-meer-chronische-q-koortspatienten-zonder-dat-ze-het-zelf-weten or https://www.omroepbrabant.nl/nieuws/4644769/veel-meer-chronische-q-koortspatienten-zonder-dat-ze-het-zelf-weten ;
Possibly hundreds of people chronically ill without diagnosis
According to interest group Q-support, about six hundred people have so far been diagnosed with chronic Q fever (see box). But there may still be four hundred to sixteen hundred people who walk around with the same disease without a diagnosis.
-
The turnout for the population screening was very low. About half of the GP practices in the regions participated. They invited only a small proportion of their patients, and less than half of them ultimately accepted the invitation. According to Q-support, this is due to a lack of time among GPs, but also 'due to a lack of knowledge about Q fever'.

DJ, Chronic Q-fever may increase risks for other infections...Diseases around goat/sheep farms still are higher. 

Retrospective it may be very hard to find out what disease(s) did cause chronic healthissues. Statistics (models) may (at best- give an indication.