Hi!
Please give 3-5 days of itrafungol the other three in order to prevent an outbreak in the not yet acute but likely already infected companions; the itrafungol will get to any infected part on the skin so they should never come down with it.
Deep clean their hutch twice: once at the start and then once again before you re-introduce. You also need to give a bath to all your piggies in order to remove any shed spores from their coats which are not in contact with the skin but may be sliding down to it or be picked up via the floor/cosies (i.e. give your piggy coats a deep clean, too).
Any shampoo will do the trick but an anti-dandruff one from the pharmacy or supermarket will be an extra layer of security. It corresponds to the Covid hand washing advice - what to can remove mechanically you don't have to treat chemically/medically. Do this before you deep clean and let the piggies dry while you deep clean the hutch with F10. So you can make sure that no spores will enter the deep cleaned hutch and it reduced your stress and labour immensely.
With a full bottle of itrafungol, you can consider whether you want to leave all 4 girls together. In this case you need to do another bath and deep clean at the end, to; once Fudge has done her full course which should in my own experience take about a week. After that you are in for a two weeks safety wait re. probable outbreak. For your own peace of mind you do a third deep clean at the end of quarantine, but that will ge it.
I would recommend to deep clean the hutch with F10 about every 3 months (recommendations vary from 1-6 months so that is down the middle) but you should be basically done with the rough bit in 7-10 days.
Our hygiene guide has all the practical details and the pictures to help you judge when Fudge is no longer acute (i.e. when no new crusts are forming) although please do the whole recommended course to make sure that it doesn't come back.
Here are our illustrated bathing guides:
Bathing (including cleaning grease glands)
Please also use the anti-dandruff shampoo for giving yourself a full body lather, especially all the areas on the face, neck, arms and uncovered legs that could have come into contact with ringworm or that you have a habit of touching unconsciously.
Basic commonsense hygiene rules have applied for ringworm long before Covid-19 has come onto the scene... but the principles are very much the same! Please be very careful to keep an eye on any children of yours because they tend to be affected worse by ringworm than adults if they catch it. See a gp promptly.
I know it is not cheap but worth spending the money and getting on top of the ringworm once and for all. It is not the worst illness around but what makes it so tricky is it cross species contagiousness and the longevity of its spores which can surpass two years if you are really unlucky.
With the vet diagnosis you can reclaim any cost from the pet shop if the outbreak has happened within 2 weeks of purchase as exposure and infection must have happened at the shop (see the link in my first post re. customer rights).
