Listeriosis is a disease caused by infection with the bacterium Listeria monocytogenes, and it is most often contracted after eating contaminated foods or liquids. Listeriosis most commonly affects newborns, the elderly, pregnant women, and those individuals with a poorly functioning immune system (immunocompromised).
I have been on Plaquenil and can tell you my diarrhea started within days of starting the med. My doctor warned me that diarrhea and weight loss were side effects. I said, Well, I am usually very constipated and could stand to lose 10 pounds so this could be a good thing.. haha.
I had side effects for about 2 week when first taking Plaquenil. I got headaches, sneezing, runny nose etc for about 1/2 hour each time I took it but persevered and so glad I did. 8 years on I am on a maintenance dose of 200mg with no side effects whatsoever. few weeks after I stopped Plaquenil, I met two people who had Lupus and had been on Plaquenil. They both stopped the drug because of side effects that included anxiety, extreme irritability, being very emotional. One of these people also had pressure build up behind her eyes which her doctor attributed to Plaquenil.