• If hand sanitizer is good for you.

• How long you should wash your hands for.

The best diet for your microbial health.

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“The reality is there’s really no place on Earth that is natural and free of microbiological life,” he says.

Recent research suggests that up to one hundred trillion microorganisms inhabit the human body. “For the most part, if you happen to have reasonably good health, you can find ways to work with microbes,” he says. Distinguishing the good ones, what he calls “bystanders” and “friends,” from the bad ones, or “foes,” is the first step.

Those good bacteria help with a variety of physiological functions, including digestion. When bad bacteria get the upper hand, taking a probiotic can help restore the bacterial balance. Tetro is a fan of probiotic supplements and calls Lactobacillus acidophilus, a common ingredient in these supplements, his “favourite” germ.

Bacterial foes include Staphylococcus aureus, which is commonly found on the skin. Antibiotics are the first line of defence against the potentially life-threatening infections it can cause but some strains have become resistant.

Another route of infection is the respiratory tract. Coughing and sneezing send infectious droplets containing cold and flu germs through the air. Tetro says if you’re within six feet, there’s a good chance you’re going to become infected if your immune system isn’t strong enough. Touching your eyes, nose or mouth after touching an infected surface is another mode of transmission.

Fortunately, practising good hand hygiene by washing with soap and water is one of the easiest ways to stay healthy. Hand sanitizer is the next best thing if you don’t have access to soap and water. “Alcohol basically shuts down everything. A bacterium simply cannot develop resistance to high concentrations — 62 to 70 per cent alcohol — because it’s a physical form of disinfection,” says Tetro.

Enclosed spaces where people congregate are bacterial hot spots, and airports are among the most germ-infested. Tetro cultured bacterial samples from touch screens in a Canadian airport and found bacteria as diverse as the global population. “I could not believe what I cultured. Some of the species that I saw, I’m like, ‘I don’t even know what this is.’”

Any form of public transportation is a breeding ground for bacteria. Tetro recently collected samples from a Toronto subway and its passengers — they’re not the only ones going for a ride. A subway pole can have 1,000 microorganisms per 10 square centimetres, but only 0.1 per cent are harmful.

Tetro wasn’t always pro-germ. During his many illnesses, he says, “I wanted to kill them all because I didn’t want anyone else to go through what I went through.” A bout with pneumonia in his mid-20s turned him from germ warrior to pacifist. He changed his diet to include more fruits, vegetables and fermented foods, and started taking probiotic supplements. “I haven’t had an antibiotic since nor have I needed one.” –SUSAN BUBAK

Top tips to stay healthy:

1. Wash your hands or use a hand sanitizer.
2. Take a probiotic supplement that contains lactic acid bacteria.
3. Only take antibiotics as a last resort; they don’t treat viral infections.

The “five-second” rule: fact or fiction?

We’ve all heard, or practised, the old adage: if food falls on the ground, it’s OK to eat if less than five seconds have passed. Here’s what “The Germ Guy” says:

“If you accidentally drop food on the ground, the stickier the food, the more likely it will pick up microbes. But this may not be a problem. If you know how clean the surface is, you shouldn’t have to worry about eating it. But if you are unsure, it may be better to discard it because you might end up suffering.”

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