Interesting for me to , for the last 3-4yrs iv'e had lungworm in my x ewes that iv'e had to treat feb / mar , can't say any have died after worming , but cases of pneumonia increase and yes some keep coughing for a week or two . I try to follow best practise but since I stopped dosing the fit ewes pre tupping the problem has increased in these , the lean ewes are wormed pre tupping and they don't seem to have a problem . Does this make sense ?? ( talked to my vet )