
Who doesn’t love animals? They’re cute, funny, and sometimes you can even use their poop to keep your skin clean!
But now, thanks to a study by a Japanese university, we may want to re-think that last one a bit. According to their research, contact with pets’ bodily fluids, either by kitty kisses or scooping up puppy poops, can significantly increase your risk of stomach cancer.
The September 19 volume of Shukan Gendai (Modern Weekly) reported on Japan’s Helicobacter Conference held in June earlier this year. The conference gets its name from helicobacter heilmannii, a type of bacteria that can cause stomach cancer, and the research was overseen by Kitasato University’s Pharmaceutical Professor Masahiko Nakamura and his team.
What did they discover through their research? Basically the worst thing imaginable: loving your pets or any other animal can cause you to get stomach cancer.
The reason for this is because of the aforementioned bacteria helicobacter heilmannii, known to cause cancerous MALT lymphoma. This infectious bacteria can be found in the body fluids of animals, especially pets, and can be transferred via saliva, waste fluids, solids, or even from just prolonged nearby exposure in a closed area.
According to Nakamura’s research, 60 percent of all patients suffering from MALT lymphoma tested positive for helicobacter heilmanni bacteria, supporting the strong correlation between the two. Previous research from Germany also showed that 70 percent of those who had the bacteria were in close physical contact with animals, and this lines up with Nakamura’s conclusion that the biggest risk factor in contracting the bacteria is being around animals.
Especially risky activities include:
- Being licked/kissed by an animal
- Kissing an animal near its mouth
- Using a food utensil that an animal has used
- Disposing of animal waste without gloves
- Kissing someone already infected with the bacteria
Potentially risky activities go beyond just the above. Something as simple as picking up a cat’s hairball with only a thin tissue, not properly disinfecting your hands after cleaning up waste, or even not cleaning up pet saliva from furniture can also spread the bacteria.
What’s worse, even just being nearby infected animal waste can pose a risk. Flies tend to gather around animal waste, and if they absorb the bacteria then land on food that you eat, you could become infected too.
According to the article, those most at risk for infection are children, due to their underdeveloped immune systems and tendency to put things in their mouth that they shouldn’t. Sure, it may look cute when someone’s pet dog is licking a baby, but nothing destroys a cute scene more horribly than the mention of cancer.
Right now it’s still fairly difficult to test animals for helicobacter heilmannii, the only way being through a polymerase chain reaction DNA test. So if you have pets, the best thing to do in order to minimize risk of infection is to continue to love them, but perhaps just not as intimately as you might like.
Columnist Mihoko Yamada had these personal anecdotes to add after her life was turned upside down by this information:
“Our dog licks people’s feet, hands, and other things in the house, no matter how many times we tell him to stop. He even licks my husband’s face. I’ll have to tell him to be more careful from now on.
“During the 3/11 great earthquake and tsunami, pets weren’t allowed into evacuation centers due to those with allergies. I thought that was a little excessive, but now that I know the pets could potentially infect other people, it’s a completely different story.”
Are you going to stop your animal-licking ways? Or will you take your chances to get that puppy love you crave? Either way, please do your best to stay safe and healthy!
Source: livedoor NEWS
Featured/top image: Flickr (Jimee, Jackie, Tom & Asha)

Yawns can be contagious for cats too, Japanese pet owner’s adorable felines prove【Photo】
A real-world Pokémon Poké Ball hotel is opening in Japan at a still-secret location [Video]
Tamagotchi evolves into a ring for its 30th anniversary, preorders now open
Family Mart releases Famima convenience store products nationwide, but which ones are worth buying?
Japan’s most popular curry rice restaurant chain, Coco Ichibanya, might be for sale
Finally! Japan’s big three convenience store chains announce rice ball price reductions
One Piece Day 2026 brings new art, music, and new cast announcements
Japan Railways announces unlimited-ride train pass for fall travel
Studio Ghibli unveils new anime calendars and diary planners for 2027
Onsen Egg Bukkake Udon Ice Cream makes us rethink everything we thought we knew about sweets
Hobonichi unveils new 2027 planners, diaries and stationery with One Piece, Suica Penguin, Hello Kitty and a must-buy Mini Techo
Japan’s final Penguin Suica train cards have already shipped, and when they’re gone, they’re gone
Solo travel in Japan: Hidden beer garden in Tokyo is a haven for single visitors
Japan approves foreign resident visa renewal fee increases of up to 967 percent, starts soon
Farewell Final Ceremony announced for Tokyo’s life-size Gundam statue, will stream live
Family Mart releases new Human Made Cup Noodle in Japan, with freebies for Nigo fans
Hikaru Utada sings new song in Shinkansen commercial for Japan’s Supreme Class cabins
Mister Donut releases new doughnuts that look and taste like Japanese sweet potatoes
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
7-year-old boy left behind on Mt. Fuji by his own dad
Sushi Bus: Japan’s first conveyor-belt bus lets you eat sushi while sightseeing around Tokyo
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Study finds hundreds of people in Indonesia legally named after Naruto, Inuyasha, other anime stars
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】