When a crowd of about 50 Aussies started pawing at their suddenly burning, aching eyes, panic set in.

Did somebody release poison gas? (But why would terrorists strike the dairy pavilion at the Royal Adelaide agricultural show?)

No, it’s so, so much worse.

Austrialian health officials were called in CSI-like to investigate the outbreak, Reuters Life! reports. The culprit: Stagnant cow urine.

Apparently wet weather triggered an extra potent pee odor -- murder on the eyeballs.

The ammonia smell sent 20 people to the hospital; 30 were treated by first aid workers. All are OK.

Just something to consider next time your eyes tear up.

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If you thought bed bugs were bad, consider this: Researchers are warning about the dangers of another invasive critter, the so-called “kissing bug,” which strikes at night and bites your face.

Properly known as triatomines, the long-feelered bugs common in the U.S. southwest are known to carry the parasite that causes Chagas disease, a potentially deadly illness with roots in Latin America. Fortunately, cases here have been rare, but that hasn’t deterred the bugs from causing damage. Most recently, they’ve been linked to dangerous allergic reactions in patients who wake up with swollen-shut eyes, itchy welts and blistered skin, struggling to breathe.

A recent study in the journal Clinical Infectious Diseases advises doctors to be on the lookout for these severe allergic reactions, which can be as serious as any bee sting in people who are sensitized. In one instance, a 46-year-old woman in the foothills of San Diego woke up scratching her leg and quickly found that she was too weak to walk and short of breath. She had to be rushed to an emergency room and treated for anaphylaxis. Other victims have lost consciousness and had seizures.

The culprit? The small brown blood-suckers attracted by light to human homes. They creep in unnoticed only to emerge at night and use scent and heat to track down humans. The reason they’ve been dubbed “kissing bugs,” is from their common habit of biting the face, which is often exposed during sleep.

Data is sketchy, but researchers at the University of Arizona’s “Kissing Bug Project” report that there were 669 exposures to kissing bugs reported to U.S. poison control centers between 2000 and 2005. They figure the number of love bug bites was actually much higher because of under-reporting.

There’s not much to do about a kissing bug bite, except to avoid it. Pest control is a good idea, experts say. This is one smooch nobody wants to wake up with.

Ever had a bug bite you on the face? Somewhere worse? Tell us about it in the comments.

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Chris Tachibana writes: Could a giant, spit-sniffing rat save your life? Maybe — they can be better than humans at diagnosing tuberculosis.

A pilot program in Tanzania is using trained rats to smell TB in sputum samples. Up to 1,000 samples a week are collected from local hospitals by APOPO, a nonprofit that also trains rats to sniff out landmines. Although the TB samples have already been checked by a human under the microscope, the rat pack’s sniff tests have improved disease detection by 44 percent because the clever rodents often find TB that was missed.

While the World Health Organization estimates that 2 billion people around the world are infected with TB, it can be hard to detect under a microscope, particularly in those who are also HIV positive. That’s where the giant rats can help. They might turn out to be just as accurate at finding TB. They're low-tech and could screen for TB in resource-limited countries. They’re also faster than the standard microscope test, says Bart Weetjens, APOPO founder. A human with a microscope can process 40 samples a day. A rat can do 40 in seven minutes, he says.

Weetjens, who was inspired by a childhood pet rat, started APOPO in the 1990s to train giant pouched rats, which are native to sub-Saharan Africa, to detect land mines in the region. The rats were so good at sniffing out hidden bombs that in 2003, APOPO started training their nosy little friends to smell TB in a spit sample. Currently working with a team of 30 rats, APOPO is now optimizing their unique program, so in the future, it might be used in other communities.

Rats aren’t the only creatures making medical diagnoses. Dogs can also be trained to find disease in humans, like smelling urine samples for signs of cancer. (One little terrier recently chewed off his owner’s big toe after sniffing out a dangerous diabetes-related infection.)

But in a nose-to-nose contest, Weetjens says rats are better than bomb- or disease-sniffing dogs.

"Whatever dogs can detect, rats can detect equally well," he says, noting a rat can be trained for one-fifth the cost. "They're more calm than most small animals, very intelligent and social, and they love humans."

Rats’ reputation as disease-carrying vermin is exaggerated. Weetjens says that in 12 years of working with the giant rats, no one at APOPO has gotten sick from them. The rats themselves are resistant to TB and many tropical diseases. "They're really lovable creatures," says Weetjens. "Like a pet you can work with."

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We've done stories before on dogs sniffing out diseases their owners didn't even know they had. Now a little terrier named Kiko has one-upped all of them: He went ahead and performed surgery. Kind of.

According to a bizarre story reported in The Grand Rapids Press, Kiko smelled an infection in his owner's right big toe and set about "amputating" it. Which in doggie terms, of course, means he ate it. All the while, Kiko's owner, Jerry Douthett of Rockford, Mich., lay passed-out drunk in his bed. (We told you it was bizarre.)

Video: Thanks to 32-ounce margarita, Jerry Douthett says he felt 'no pain'

Douthett awoke to find a bloody stump where his big toe used to be, and he and his wife rushed to Spectrum Health in Grand Rapids, Mich. There, they discovered Douthett actually had type 2 diabetes and was suffering from a dangerous infection in his big toe. Doctors finished the job Kiko had started, and amputated what was left of his toe.

Douthett's wife, Rosee, a registered nurse, had actually suspected her husband had diabetes and insisted he get checked out. But before he did so, he had a few beers. And then a few margaritas. After that, he went home, passed out, and Kiko got to work. Weird story, but Bruce Rossman, a media relations manager at Spectrum Health, confirms that it's true.

Do you credit your own pet with saving your life? Tell us about it in the comments.

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