Australian scientist claims that diseases transmitted by cats to people cost the Australian economy AU$6 billion annually

I find this extraordinary. Unfortunately I don't have access to the full article by Donna Lu on the newscientist.com website because you have to subscribe to the site and I don't want to do that (but see update below please). But the opening paragraphs state that diseases transmitted by the domestic cat to people, including cat scratch disease, cost the Australian economy more than AU$6 billion per year (4.2 US dollars). The costings are based upon the impact on human health and livestock production. Clearly they are inferring that domestic cat spread disease to livestock as well or is it that people are incapacitated and therefore can't farm? They may be referring to toxoplasmosis. No doubt they are because this disease always comes up in these sorts of discussions. The author emphasises cat scratch disease and bites.

Prof Sarah Legge. Photo: Australian National University.

Well, there you are. I will have to speculate as to how they have calculated this cost. But they must be saying is that cat owners and non-cat owners are being bitten or scratched by domestic and stray cats which removes them from the workplace for a day or two while they recover. Or perhaps they go to hospital but this is normally extremely rare.

99% of cat bites and scratches do pretty well nothing in terms of interfering with one's day-to-day living. That's my personal experience. Toxoplasmosis is almost always asymptomatic in people i.e. no symptoms. Cat scratch disease is rare in people. Certainly, cats can cause it but I would speculate that one in 500 or 1000 scratches results in cat scratch disease. It needs to be treated. Bites are not uncommon but most often are irritations more than injuries that need to be dealt with immediately. That said when bitten by a cat you have to be vigilant and watch the area where you were bitten. As soon as it looks as if it's becoming infected you must take antibiotics as prescribed by a doctor to ensure that they are the right antibiotics. This is an absolute must as stated. Because if you let an infection caused by a cat bite get worse it can cause a serious injury and it can lead to hospitalisation.

Zoonotic diseases transmitted by cats to people are on the whole pretty rare and therefore have difficulty in understanding how they arrive at a AU$6 billion cost.

Update

I have found an article on a Chinese website which discusses the research by Prof Sarah Legge of the Australian National University and the University of Queensland. She argues that annually over 500 people die in Australia and there are 11,000 hospitalisations due do diseases transmitted by cats to people. The costs include medical treatment, reasonable relevant expenses, lost income et cetera.

She refers to toxoplasmosis as mentioned, roundworm and cat scratch disease. Of these toxoplasmosis has the biggest negative impact on the Australian economy. She claims that it has possible long-term effects on behaviour and mental health. Note, the word "possible". She doesn't know and therefore how can she make calculations on the back of it.

She claims that the parasite that causes toxoplasmosis causes 200 deaths and 6,500 hospitalisations due to car accidents which could be avoided in Australia annually. She believes that the disease causes mental health disorders which I presume are translated into poor driving! She claims that one in five cases of schizophrenia and one in 10 cases of suicide were caused by toxoplasmosis. She wants domestic cats to be kept indoors all the time in Australia and for people to wash their hands thoroughly after handling cat litter or gardening. This is to stop transmission of toxoplasma gondii oocysts in the soil or faeces in the litter tray to the hands and from the hands to the mouth and therefore ingested.

She also claims that feral cats around towns are a reservoir for disease.

Human behavior

We have to discuss human behaviour in this equation. Most cases of toxoplasmosis are caused by mishandling of raw foods in the kitchen. That's due to careless human behaviour. Being scratched or bitten by cat is often put down to careless human behaviour. Contracting toxoplasmosis through mishandling of cat litter or when gardening, once again, can be put down at least in part two careless human behaviour. Therefore this vast economic loss to the economy in Australia as stated is in large part due to human behaviour. It is unreasonable to blame the cat exclusively as this professor is.