Feline Infectious Peritonitis (FIP) is an unusual, but often fatal, consequence of coronavirus infection of the cat and ferret. The majority of cats and ferrets infected with coronaviruses lead perfectly normal lives. However, if you are thinking of buying a pedigree (purebred) kitten - INSIST that he or she is feline coronavirus (FCoV) free - otherwise you may be buying heartache.  A paper published in Feb 2012, shows how such quarantine and testing has kept the Falkland (Malvinas) Islands free of FCoV and FIP.

This website exists to promote knowledge amongst veterinary surgeons, cat lovers, breeders and rescuers, to give the latest news on FIP treatment and prevention and to raise funds for much needed research.

I also seek to provide access for veterinary surgeons to information which is not readily available elsewhere: on the subjects of feline blood groups, feline chronic gingivostomatitis and with a directory of genetic and inherited diseases which have been reported in cats so that vets can check for any breed predispositions when presented with an unusual case.

Dr Diane D. Addie


April 2017




Welcome to my website.


Aims of website      News     Donate to FIP research      You can help FIP research Who's Who at Catvirus.Com contact Contact Support this website: become a subscriber

The site in other languages



There are 7 aims of this website:

1. to provide accurate and up to date information about feline coronavirus (FCoV), the cause of feline infectious peritonitis (FIP) in cats and ferrets.

2. to provide a register of FCoV tested studs and queens so that enlightened cat breeders who know their cat’s FCoV status can contact each other. In the 1970s, Abysinnian cat breeders began testing for FeLV and eliminated it from their breed, other cat clubs followed suite. Now, at least in the UK, it is extremely rare for a pedigree kitten to be sold with FeLV, thanks to the dedicated testing of cat breeders. In Scotland, most Birman breeders are FCoV free. The war against coronavirus and FIP has begun - I hope you will join it.

3. to provide a register of FCoV free kittens.

4. to provide a register of stud and queen cats of known blood type.

5. to provide information about feline blood groups and neonatal isoerythrolysis.

6. to raise urgently needed funds for FIP/FCoV research.

7. to provide up to date information about feline chronic gingivostomatitis



FIP and Coronavirus book for cat lovers now available in Spanish (in addition to English) in kindle from Amazon websites, and as a download e-book from this website

Falkland (Malvinas) Islands declared FCoV free

YouTube Channel has had over 160,000 views

CPD for veterinary surgeons: Dr Diane D. Addie's webinars on FIP diagnosis, and on FCoV and the gastrointestinal tract are available in recording at the Webinarvet

FIP treatment

Ferret infectious peritonitis (FIP) - a newly recognised threat to ferrets

Italian cat breeders and veterinary surgeons filled the hall to learn about FIP


My new email address is in my book "FIP and Coronavirus"

My current email address is in the recent versions of my book FIP and Coronavirus. The answer to most of your questions is in the book. You can also find it by becoming a subscriber to this website. If you do want a consultation with me, details of how to do so are in the book.

Please note that emails to my former address (draddie[at]btinternet.com) will no longer be received / replied to. Emails to my University of Glasgow email address will still be received, but there is a delay in getting them, thus a delay in responding.

Help keep this website and YouTube channel advertisement-free: become a subscriber

If you appreciate this website please become a supporter by sending a monthly donation.

Catvirus.com subscription (USD)

Catvirus.com subscription


Catvirus.com subscription


""Feline Infectious Peritonitis and Coronavirus" - an ebook written for cat guardians or purchase the physical version from Amazon.


To buy in UK pounds
£5.00 GBP:

To buy in US dollars

To buy in Euros
€7.50 EUR:

This book is available as an e-book from this website - see above - or as a paperback or kindle in English or Spanish from Amazon:


Download a free sample eBook of "My Cat Has FIP - What Now?"

This book is written for anybody unfortunate enough to have had FIP diagnosed in their cat. It will help you through the maze that is FIP diagnosis, to decide what your options are for treatment and to safeguard your other cats, or how and when to safely add a new cat to your household.

Please note that this is a zip folder containing an .exe file and that you may have to alter your firewall or virus protection program to allow it to download. This is a new experiment for us, so please let us know if you encounter any problems downloading it (email e-books [at] catvirus.com). You can still use the regular Buy Now buttons below to purchase the e-book if you prefer.

At present, you can only buy the whole eBook directly (and within minutes) from the sample eBook in US dollars. To buy it in GB pounds or Euros, please use the Paypal links below and we will manually send you an activation key within 24 hours. A physical version can be obtained from any of the Amazon websites.

Note that everything in these books is available for free here on the website!


The chapters are:

1. Everything you need to know when your cat has been diagnosed with FIP

...... Download FIP diagnosis Step 1 questionnaires to take with you to your veterinary surgeon

........(This download will open up in a new page as a word document.)

2. Everything you need to know about treating a cat with FIP

...... Download a current FIP treatment sheet from the Downloads menu to take with you to your veterinary surgeon.

3. Preventing your other cats or kittens from developing FIP

4. Everything you need to know about getting another cat or kitten

5. Everything you need to know if your cat or kitten is diagnosed as having diarrhoea caused by FCoV

6. Everything you need to know if you work in a rescue shelter or boarding cattery

7. FCoV/FIP prevention in trap, neuter, return (TNR) programs

8. Everything you need to know if you keep a lot (over 6) pet cats, or have a cat sanctuary or colony

9. Everything you need to know if you are a cat breeder

10. What you can do to help fight FIP

11. Everything you need to know to find more information

Download the photographs from the book in colour (this will open as a .pps in a new window).

Back to top

Falkland (Malvinas) Islands declared FCoV/FIP free

As regular visitors to the site will know, one of my dreams is to eradicate FCoV, and therefore FIP, from the whole world!  Some years ago, the veterinary surgeons on the Falklands Islands, suspecting that the cats who lived there were already FCoV free, instituted a policy where all cats being imported to the Islands had to test negative for antibodies to Feline Coronavirus, the virus which cases Feline Infectious Peritonitis (FIP).  We published a paper (will open in a new window) in the Journal of Feline Medicine and Surgery (JFMS), the journal of the International Society of Feline Medicine, showing that this policy was effective. 

On a smaller scale, you can keep the cats in your household FCoV free (and therefore FIP free) by testing new incoming cats and kittens for FCoV antibodies BEFORE bringing them into the house.  Too often I hear sad tales of an existing pet developing FIP after the introduction of a cat or kitten from a high-risk source, such as a breeder or rescue shelter. There are good breeders out there producing FCoV-free kittens - be sure to demand a FCoV antibody test before purchase.  If the test turns out to be positive, then one can test the faeces to determine whether the cat is actually shedding virus, and if so, wait 2-3 months and re-test if you're keen to have that particular cat (or rehome the cat to somebody with no other cats).  


Back to top

CPD for veterinary surgeons: recordings of Dr Diane D. Addie's webinars on FIP diagnosis, and on FCoV and the gastrointestinal tract are available at the Webinarvet

Recordings of my webinars on the diagnosis of effusive and non-effusive FIP and on feline coronavirus and the gastrointestinal tract are are available from the Webinarvet website. These webinars are part of a series: watch this space for news of the next one. I also did one on FeLV and FIV diagnosis.


FIP Treatment

When I began this website, FIP was incurable. Now, with the introduction of feline interferon omega (Virbagen Omega by Virbac) into some of Europe we are seeing some cases enter remission and others being cured. In summer of 2009, an exciting paper appeared by Prof. Al Legendre of Tennessee Veterinary School in the Journal of Feline Medicine and Surgery reporting cure of 3 cases of non-effusive FIP using Polyprenyl Immunostimulant from Sass & Sass. This paper is a hopeful pilot study and I look forward to a controlled clinical study. Unfortunately, Polyprenyl Immunostimulant does not work on effusive (wet) FIP cases.

My dream is for no cat ever to contract FIP in the first place, never mind die of it.

For more on FIP treatment - visit my FIP treatment webpage. The search for a cure is hampered by lack of funds, if you would like to donate to FIP research, you can do so on this website.


YouTube Channel has now had over 160,000 views!

I am happy to announce that my You Tube channel dealing primarily with Feline Infectious Peritonitis and Feline Chronic Gingivostomatitis, has already been viewed over 160,000 times. I am deeply grateful to talented French veterinary animator Dr Francois Bagaini of Vetocyte.fr for bringing some of my ideas to life by his animations. These videos form a key part of my dream to eradicate FCoV and therefore FIP - once people learn how to prevent their cats catching the infection, then FIP will simply no longer occur. Please share the videos and press the thumbs up "like" button if you would like to help eradicate FIP ,

To visit the channel, go to You Tube.

Our most recent video shows how people can prevent FCoV gaining entry into their household of cats by testing newcomer cats (or kittens) for FCoV antibodies:



Here is our cartoon indicating how FCoV is transmitted, this video has already had over 60,000 views of the English version:


Please press the thumbs up "like" button to support our videos and share them.

Back to top

Ferret infectious peritonitis (FIP) - a newly recognised threat to ferrets

(This section is written for veterinarians.)

It has been known for a while that ferrets had a unique coronavirus of their own (ferret enteric coronavirus, FECV) which causes epizootic catarrhal enteritis [3,4]. They also suffer from a disease which looks very much like infectious peritonitis of cats [1,2] and I am most grateful to Dr Jerry Murray, a ferret expert in Dallas, Texas, for bringing this to my attention.

Reported clinical signs include anorexia, weight loss, diarrhoea, large palpable abdominal masses. Effusions have not been described. Antibody against feline infectious peritonitis virus can be used in immunohistochemistry to confirm diagnosis.

At present moment, treatment is similar to that of FIP in cats - prednisolone. It is unknown whether interferon would help these ferrets or whether Primucell vaccination (Pfizer) would be effective in preventing it, though there is no reason to suppose it would not be protective (however, it would be used off-licence).

Glasgow University appeal for samples from British Ferrets


1. Juan-Salles C, Teifke JP, Morera N, Jiminez J, Montesinos A, Ardiaca M, Loehr CV, Garner MM.  2006 Pathology and immunohistochemistry of a disease resembling feline infectious peritonitis in ferrets (Mustela Putorius Furo).  Vet Pathol  43:5  p845

2. Martinez J, Ramis AJ, Reinacher M, Perpinan D. 2006  Detection of feline infectious peritonitis virus-like antigen in ferrets.  Vet Rec.  158(15):523

3. Williams BH, Kiupel M, West KH, Raymond JT, Grant CK, Glickman LT.  2000   Coronavirus-associated epizootic catarrhal enteritis in ferrets. J Am Vet Med Assoc    217(4):526-30.

4. Wise AG, Kiupel M, Maes RK. 2006  Molecular characterization of a novel coronavirus associated with epizootic catarrhal enteritis (ECE) in ferrets. Virology.   349(1):164-74.



Italian cat breeders and veterinary surgeons filled the hall to hear about FIP and Coronavirus in Tuscany in June 2013

Full hall at FIP conference Tuscany 2013

The event was organised by the wonderful Loretta Bartolucci and Italian veterinary surgeon Dr Francesca Serena, who gave an introductory lecture on stress and feline welfare. Francesca and Loretta can be seen below flanking the translator Nico, who did a really excellent job.

Francesca Serena Loretta Bartolucci Nico


Madrid, Spain, 2010

This highly successful event sold out with over 150 delegates attending - I'm sorry if you tried to attend and were not able to. However, the proceedings are available (in English and Spanish, to veterinary surgeons only), though I believe you have to order a quantity of Purevax vaccine in order to get a free copy of the proceedings. Please contact Dr Daniel Rodes, of Merial, Spain - Daniel.RODES@Merial.com - to find out how to obtain a copy.


Greene's Infectious Diseases of the Dog and Cat - 4th edition launched

I was proud to be invited to contribute to the Fourth Edition of Prof. Craig Greene's legendary textbook "Infectious Diseases of the Dog and Cat."  For me, this is the Bible of canine and feline infectious disease.  It is available from Amazon.  [Note - it is for veterinary surgeons only.]





Who's Who at Catvirus.com

The author: Dr Diane D Addie

Dr Diane D Addie is a veterinay surgeon and virologist who has spent the last 23 years researching feline infectious peritonitis (FIP) and feline coronavirus infection (FCoV). She qualified as a veterinary surgeon from the University of Glasgow, in Scotland, and spent 8 years in small animal practice in the north of England. She returned to Glasgow Veterinary School to research into FIP, her PhD was entitled "Studies on the humoral immune response to feline coronavirus." She is Honorary Senior Research Fellow at the University of Glasgow, Scotland, U.K and Director of the Feline Institute Pyrenees in France. Dr Addie serves on the European Advisory Board of Cat Disease.

Her dream is to eradicate FIP, at least from pedigree/purebred cats, and preferably also from rescue shelters, within the next 10 years. By becoming informed and spreading reliable knowledge, or by fundraising for research you can help her fight FIP.

She takes the stand that she prefers not to experiment on animals and all her studies have been on animals who have become infected or sick naturally and whose veterinary surgeons or guardians have contacted her.

In 2003 she received the Amoroso award for for outstanding contributions to small animal studies by a non-clinical member of university staff. She served on the council of Cats Protection for 20 years and is currently a patron of the Celia Hammond Animal Trust.

Declaration of lack of vested interests

The opinions and recommendations given on this website are completely independent - Dr Addie is not in on the payroll of any corporation, nor does she hold shares in any company mentioned on this site, nor is she on any board of directors of any corporation or company whose products are mentioned on this site, with the exception of the ebooks for sale on this site, where she receives up to 65% of the income, this being her main source of income. Dr Addie takes no income from donations made to the Angelica Trust.

She is a member of the European Advisory Board of Cat Disease whose meetings are funded by Merial, but whose veterinary members are volunteer and are unpaid. Merial simply pays the travel expenses and hotel.


Your use of this website at your own risk.  This site is for information purposes only and is in no way intended to replace a consultation with a fully qualified veterinary surgeon (veterinarian).  The information in this site cannot and should not be used as a basis for diagnosis or choice of treatment. Dr Addie excludes all liability whatsoever for any loss or damage arising out of use of this site or reliance upon its contents and strongly advises all users with veterinary related queries to consult a veterinary surgeon.


Dr Diane D. Addie is available for consultations for infectious disease control or diagnosis to veterinary hospitals, rescue shelters, boarding and breeding catteries and industry. She is also available to laboratories for consultation for the development of diagnostic tests. For private, individual, consultation regarding your own pet, you must obtain the permission of your veterinary surgeon in writing for me to consult with you before you contact me (these are the rules of the Royal College of Veterinary Surgeons). Email: draddie [at] catvirus [dot] com.


The web designer: Melody Amundson

Melody Amundson of Mariposa Creations made this site possible by generously offering her fantastic web designing skills free of charge as her generous donation to the cause of fighting Feline Infectious Peritonitis. She has given of her time and skills for over 8 years to keep this website working! You can see how artistic she is from the beauty of this website and the Orion Foundation website, and another example is her lovely colouring book for children, which you can purchase from her Devon Heaven website. Melody is a breeder of Devon Rex kittens and is active in the cat show world in the USA. She also forays into the world of cat rescue and any cat who crosses her path will benefit from the encounter!

The translator:Renata Fernandes

Renata Fernandes of rftranslations arranged translations of the site into other languages. Each language had 4 translators working on the website's text plus a proofreader at the end. Over 30 people from different parts of the world were willing to help get rid of coronavirus by using their translating skills and did so ENTIRELY VOLUNTARILY! This was an astonishing donation to help spread the word on FIP!

Renata has her own animal website AnimalSofties.com.


FIP forums and chat groups

Unfortunately I am unable to answer all the queries that come to my inbox. I'm very sorry, but I'm sure you'll appreciate that every moment spent responding to queries is a moment less to devote to research. In addition, it would be unethical for me to advise another veterinary surgeon's client without their consent. Time permitting, if you donate to FIP research and provide written consent for me to respond to you from your veterinary surgeon, I will try to answer some queries. Go to the Angelica Memorial Page to make a donation.

Forums and chat groups provide support and answer queries for people with a cat suspected of having FIP or for those who are unfortunate enough to have lost a cat to FIP. The one I personally recommend is the FIP Advisory and Care group:


I also host a subscription only Facebook page called EndFIP which can be found on this address:


The site is continually being updated and new material added.  I hope that you will find the answer to your questions here and that you’ll come back soon.  


"The light shines in the darkness, and the darkness could not put it out."


God bless you and your cats!

Last updated 21 April 2017

If you'd like to put a graphic link to us on your site,  please use this banner with the link:  

http://www.catvirus.com  Thank you!



 2000-2017 Dr. Diane Addie
Site Design © Melody Amundson, Mariposa Creations

 All rights reserved.
You are welcome to take anything you like from this site, but we esteem it a courtesy if you acknowledge the source and put a link to the site.