Prevent FIP in pedigree kittens

To avoid FIP in your new purebred kitten make sure he or she is negative for feline coronavirus antibodies  

It is absolutely heartbreaking to watch a beautiful young kitten develop feline infectious peritonitis (FIP) and die. Purebred (pedigree) kittens and young pedigree cats account for 70% of all deaths to FIP.

This webpage will alert you to danger signs of early feline coronavirus (FCoV) infection and the early stages of FIP, when you go to buy a pedigree kitten and towards the end of the page there are resources for you to help increase FIP awareness and stamp out FIP if you would like to help with my campaign to eradicate FIP.


Before buying a purebred kitten you should ask 4 searching questions of the cat breeder, and look for 5 important signs to try to ensure that the pedigree kitten you buy will go on to lead a full and healthy life. Best of all: ask to see a certificate saying that the kitten you are to buy is negative for feline coronavirus (FCoV) antibodies: FCoV is the virus which causes FIP.

Whatever you do, buy pet insurance for your pedigree kitten: if he or she develops FIP you can end up with a veterinary invoice in the thousands. I have to say that over the last few years, since a cure for FIP was discovered, Petplan Pet Insurance behaved absolutely honourably and paid out for FIP treatment (I am not sponsored by them: I am naming them because they were so much better than other insurers of my online clients).

Already there have been successful prosecutions of breeders who have sold FCoV infected kittens, under both the UK and Australian Sale of Goods Acts and also the Prevention of Cruelty to Animals Act. Cat breeders who sell kittens which are FCoV infected and develop FIP risk being prosecuted or sued. However such is no consolation for people who have gone through the distress of watching their kitten sicken and die. Be sure that you choose your kitten from a GOOD cat breeder: one who is FCoV-aware and taking steps to breed FCoV-free (and so FIP-free) kittens.

Have the kittens had any diarrhoea?

Have the kittens had cat flu signs?

May I see your litter trays?

Are the kittens FCoV antibody tested?

Look at the sizes of the kittens in the litter - are they all the same, or different sizes?

Notice, or find out, how many cats are in the house
Look at the kitten's eyes - is there any sign of discharge? Are the 3rd eyelids showing?
Are the kittens running loose or are they in a room on their own?
Is there any diarrhoea in the litter tray, and which cat litter is being used?
What you can do to help save purebred kittens from FIP

Put up a poster to increase FIP awareness

Four important questions to ask the breeder of the kitten you may buy

Have the kittens had any diarrhea?

When the virus which causes FIP, feline coronavirus (FCoV), first infects kittens at around 5-7 weeks, they often experience diarrhoea. The diarrhea is usually self-limiting (i.e. it goes away without treatment) and may not be too severe, though sometimes it is severe. There are many reasons for kittens to be diarrheic - e.g. food change, intestinal parasites or protozoa such as Tritrichomonas foetus or Giardia - but FCoV is one of the most common and was found to be significantly associated with enteritis. Please watch the tale of this little Sphynx kitten who had chronic diarrhoea and fecal incontinence since being bought from her breeder.


(Please excuse me swapping between the English and American spellings of diarrhoea - it is to help search engines find the information.)

Have the kittens had cat flu signs?

Although cat flu has a number of different causes, another sign which was significantly associated with getting infected by FCoV was sneezing and mild signs of upper respiratory disease. However, FIP was not associated with ulcers in the mouth - that is usually caused by feline calicivirus.

May I see your litter trays?

If litter trays aren't in evidence, ask to see them - see below for guidance on what to look for.


Are the kittens FCoV antibody tested?

Kittens who have a FCoV antibody titre of zero (i.e. less than 1:10) should be safe to buy. Kittens tested using a test which screens the blood dilution at more than 1:25 will NOT be safe to buy, some laboratories begin at 1:100 or even 1:400: this will miss most infected kittens. There are many different FCoV antibody tests of widely varying quality on the market. The statements made on this website about antibody testing are ONLY relevant to the immunofluorescent antibody test used in the University of Glasgow Veterinary School Veterinary Diagnostic Services and the recommended laboratories and test kits listed on the Feline Coronavirus Antibody page.  These laboratories receive blood samples for FCoV antibody testing from all over the world, the samples don't "go off" in the post, they will still give a relevant antibody titre even after 2 weeks in the mail. (For non-EU countries, check the list of recommended laboratories and tests for FCoV antibodies .)

If you are shown a certificate, be sure to check the age at which the kitten was tested - kittens tested before they are 10 weeks of age may be infected but be too young to have produced antibodies of their own.  For a negative antibody result to be meaningful, the kitten should be at least 10 weeks old when tested. By a negative FCoV antibody result, I mean an antibody titre of 0 or less than 10. Watch out for tests which count as negative anything under 1 in 400 (1:400) - this is far too dilute and will miss many infected kittens and cats, this is especially a problem in the USA.

You can buy a kitten who has an antibody titre of greater than zero, if you fully accept the risks of doing so. The risks are two - first that the kitten could develop, and die from, FIP. Secondly, if you have other cats, the kitten could infect them and they could die of FIP. You could get a further test - called FCoV RT-PCR - done on a faecal sample. FCoV RT-PCR testing will tell you whether the kitten is actually excreting virus. If the kitten is definitely infected, you may decide to look elsewhere for a negative kitten. If you heart is set on that particular kitten, remember that his or her faeces will pose a risk to any other cats you have at home - so get your own cat vaccinated with Felocell FIP (also known as Primucell), if you are in a country where the vaccine is available. Otherwise keep your kitten's litter tray away from your own cat and use a non-tracking cat litter, like World's Best. To minimise the risk of FIP developing in the infected kitten, keep stresses to a minimum - see the webpage on preventing FIP.



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Five important things to look for to try to ensure that the kitten you buy will go on to lead a full and healthy life

Look at the sizes of the kittens in the litter - are they all the same, or different sizes?

This is probably the single most important thing you can easily check to maximise your chances of buying a FCoV-free purebred kitten. Make sure that the cat breeder shows you the whole litter of kittens - not just the kitten he or she is proposing to sell to you. Look at the kittens in the photograph on the left - see how they are different sizes. Two of these 3 kitten littermates went on to die of FIP - first the one on the left - the biggest kitten - then the poor little runt in the middle. Contrast them with the Ragdoll littermates in the photograph on the right who are all roughly equal in size.

(I thank CuanCats Ragdoll breeder for the Ragdoll photograph on the right.)

Notice, or find out, how many cats are in the house

FIP is most likely to occur in households which have too many cats relative to the amount of space available. Very often households with fewer than 10 cats will spontaneously eliminate FCoV infection. If there are more than 6 cats in an ordinary house, cat behaviourists tell us that those cats will begin to feel the stress of being overcrowded. Some breeders have outside runs to give the cats more space. Another consequence of having too many cats in one environment is that the amount of coronavirus (and other pathogens) builds up, even when the breeder is doing their best to be hygienic. FIP is much more likely to develop when there cats and kittens are challenged with a large dose of virus.


Look at the kitten's eyes - is there any sign of discharge? Are the 3rd eyelids (nictitating membranes) showing?

In my early studies, I found that a sign of FCoV infection in kittens was a history of mild flu-like signs. Check whether the kittens are sneezing or if they have a discharge from the eyes.

Looking at the eyes is very useful also to notice whether the third eyelids are protruding more than is normal - that is a sign of a gut infection, often FCoV. You can practise on the photographs of the cats below: you can see two photos of Luca, the Russian blue cat (a and b) and Oreo (c) - in your opinion which cats have protruding nictitating membranes?









Answer: photographs b and c show cats whose third eyelids are protruding slightly (see the green arrow in photograph b). I am most grateful to their guardians for allowing their photographs to be used. Nictitating membrane protrusion isn't a sign of FIP - it's usually a sign of a gut infection and unfortunately pedigree kittens often have an abundance of those: Giardia, Tritrichomonas foetus and other parasites and bacteria as well as coronavirus (Paris et al, 2014). There are other causes of this phenomenon, one is called feline dysautonomia and is a consequence of eating Botulism toxin in dry cat food. If you ever see a protruding 3rd eyelid, take your cat to see your veterinary surgeon immediately.


Are the kittens running loose or are they in a room on their own?

In my first FCoV survey, we noticed that 50% of kittens who were allowed to mix with queens other than their mothers, and/or kittens from other litters, became infected with FCoV.  Only one third of kittens who were kept only with their littermates and antibody positive mothers became infected, therefore breeders who allow their kittens free run of the house are much more likely to be selling you a kitten who will die of FIP. Breeders point out that socialisation of the young kitten is essential for the development of a kitten who will make a good pet - while this is true, it's not an excuse for allowing the kitten to become infected with a life-threatening virus.


Is there any diarrhoea in the litter tray, and which cat litter is being used?

FCoV, which causes FIP, is mainly shed in an infected cat's faeces and is then eaten or inhaled by a susceptible cat or kitten.  FCoV is a very infectious virus. A typical sign of early FCoV infection is diarrhea in the kittens and occasionally adult cats - so have a look at the litter trays to see if you can spot any diarrhea. It is also useful to look at the trousers and underside of cats' tails to see if there is any faecal matter adhering to it, which is an indication of loose stools. Of course there are many causes of diarrhoea in cats other than FCoV infection, but FCoV is one of the most frequent, and serious, causes in pedigree kittens.

Look at the cat litter too - what kind is it? Is it tracking outside of the litter tray? Cat litter which tracks all over the house on feline and human feet is more likely to spread FCoV, than clumping, non-tracking litters. The litters that turn into sawdust are amongst the worst.


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What you can do to help eradicate FCoV and FIP from purebred kittens


Help to educate cat breeders and veterinarians

Unfortunately many breeders are quite unaware of feline coronavirus (FCoV) and feline infectious peritonitis (FIP): sometimes because the kittens take many weeks or months to die of FIP in their new homes. If you know any cat breeders or veterinary surgeons, please inform them about this website. Please spread the word about FIP using any social media (Facebook, Twitter, Instagram, Bastyon, MeWe, etc) - even if you don't like this website, then choose one that is to your taste. If you want to inform somebody who isn't on the internet, there is my book "Feline Infectious Peritonitis and Coronavirus" available from Amazon. For veterinary surgeons there is my free download "FIP diagnosis algorithm."

Please put our FIP awareness posters and photographs on your Facebook page, your website, blog, in your local veterinary surgery or any public place: sharing information saves cats' lives

Thanks to the generous sponsorship of Maria Bonino, and the design genius of Magda Becerra can now proudly introduce a selection of beautiful posters with the key message: "If you intend to get a purebred kitten, have him or her tested for FCoV antibodies BEFORE you buy." The purpose of the posters is to increase FIP awareness and to encourage consumer pressure on breeders to ensure that their kittens are FCoV-free. These posters are open access and copyright free - we welcome you to personalise them: put your own logo on them (in the word doc version there is a text box for your logo), or translate them into your own language. At present, they are available in English, French, Spanish, Italian, Portuguese (thank you Cristina Sobrel) and Thai (thank you Anisa).

Below you will see thumbnails of the different posters, and below each, a link to either a jpg (high resolution photograph), or word docx which you can edit yourself and put your own logo into if you have the software to do so. In the docx you will see a text box which says "Your Logo Here" where you can put your own logo or website or whatever you please. Please be patient, these are big files and may take quite a long time to download (they will open in a new window or tab and in some browsers they will simply download).

Please help yourself to these photographs and posters - please share them on your website, blog, your Facebook page, put them up in your library, veterinary surgery, anywhere people will be able to see them. If we can stop FIP in pedigree kittens, we will prevent 70% of all FIP. This can only be achieved by spreading awareness to put consumer pressure upon cat breeders to take FIP seriously and to breed feline coronavirus free kittens.


Bengal Birman kitten poster jpg (185 KB)

Bengal Birman kitten poster doc (2.7 MB)


British kitten poster jpg (160KB)

British kitten poster doc (xxxMB)


Buy pedigree / purebred kitten (105 KB)

Buy_purebred_kitten.docx (45 KB)



Acheter un chaton pure race jpg (196 KB)

Acheter un chaton pure race docx (2.7 MB)


Pensando comprar gatito? jpg (221 KB)

Gatito_Raza_Pura_PIF.docx (2.7MB)


Pensando aquistare un gattino jpg (562 KB)

Pensando aquistare un gattino.docx (2.2 MB)


Gathino jpg (200 KB)

Gatihno_British_Shorthair_Bengal_Birman_PIF.docx (2.2 MB)



Thai poster pdf (5.4 MB)








Ein Bengal Kätzchen kaufe? (144KB)

In an amazing synchronicity, independently of our poster efforts, talented photographer and artist Kerry Bunyan was also designing beautiful posters for anybody to display. Kerry turned her sadness and anger at the loss of her beloved cat, Madi, against the virus who cruelly took her, by creating these beautiful posters for you to use if you wish ....


What lurks within is a hideous thing jpeg (98 kb)


Be feline coronavirus aware jpg in higher resolution (67.1 kb)







From FIP to RIP_- be coronavirus_aware.jpg (267 KB)


Please be coronavirus aware,

It's what we must do if we really do care, ... (183 kb)

Kerry can be found on Facebook at Kerry Bunyan



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Paris JK, Wills S, Balzer H-J, Shaw DJ, Danièlle A Gunn-Moore DA. 2014  Enteropathogen co-infection in UK cats with diarrhoea BMC Veterinary Research  10:13


5 April 2023

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Graphics İ Melody Amundson, Mariposa Creations