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As flowers bloom and temperatures climb, many are eager to get back outside. But while the sun may be shining, there is a dark side that can make the great outdoors not so great.

Gangs of germs are lurking in the woods, in the soil, in the water and in your food, ready to rain on your summer parade.

Taking precautions against outdoor pathogens can keep you from getting sidelined over the summer.

I’m a at the Indiana University School of Medicine, where I study and teach about infectious disease. Here are some things to keep in mind to help you and your loved ones stay free of illness while enjoying summer activities.

Germs in the backyard

There’s nothing like the smell of a good barbecue and fresh goodies from your own garden. To make sure people leave your party with only good memories, be aware of germs commonly linked to , which can result in diarrhea, cramps, nausea, vomiting and fever.

Meats, including fish and poultry, often house harmful bacteria such as , or . Raw meat can contaminate anything it touches, so be sure to wash your hands and disinfect surfaces and utensils. To avoid cross contamination, do not keep uncooked meat near prepared foods. Meat products must be cooked to to ensure harmful germs are destroyed before consuming.

Washing cooking utensils that touch raw meat can reduce cross contamination.

In addition to bacteria, a parasite called can cause acute food poisoning. Toxoplasma parasites are shed as microscopic . Oocysts for a year or more, and other animals, including people, can inadvertently ingest them.

Upon infection, Toxoplasma forms in the flesh of food animals – another reason to cook your meats thoroughly. need to take special care in avoiding Toxoplasma, since the parasite can cross the placenta and cause miscarriage or birth defects.

To avoid getting toxoplasmosis from oocysts, people should wear gloves while gardening, wash fruits and vegetables, and make sure the sandbox is free of cat poop and covered when not in use.

Germs in the water

Recreational water facilities, such as pools, water parks and fountains, are a great way to beat the summer heat. The is a good sign that the water is being treated to kill many types of germs.

Unfortunately, some germs can remain infectious in chlorine for several minutes or days, which is plenty of time to spread from one person to another. These include viruses such as , bacteria such as , and parasites such as and .

Accidental ingestion of these germs can cause stomach problems, including diarrhea, which can become serious if it . To avoid becoming infected, swim in well-maintained facilities and avoid swallowing the water. To avoid infecting others, stay out of public water for at least a week if you have diarrhea.

While a well-chlorinated pool can kill most germs, some may still lurk in the water.

Bacteria in the water that get trapped in the ear can lead to a painful infection known as , which can be prevented by wearing earplugs in the water.

Ponds, rivers and lakes can also be home to these diarrhea-causing germs. Warm fresh water may also contain , the so-called “brain-eating amoeba.” While extremely rare, inhaling water containing Naegleria fowleri is . Wearing nose plugs can help prevent infection.

If you’re going to reach for the beach, be sure to reach for waterproof bandages if you have an open wound, piercing or tattoo. Global warming has produced a rise in so-called “” that cause a dangerous condition called . These infections can be very difficult to treat and may result in surgical removal of affected tissue or limbs.

Shellfish such as oysters, clams and mussels filter ocean water as they eat, causing germs to get trapped inside their bodies. Consuming raw shellfish can lead to serious food poisoning due to infection or .

Germs on the trail

While hiking or camping, you may come across water that looks clean enough to drink, but don’t be tempted.

Be sure to you drink to avoid bacteria such as and parasites such as and . These intestinal pathogens will produce cramps, nausea and diarrhea – especially unpleasant symptoms when you don’t have access to indoor plumbing.

After a very mild winter, you can expect a lot of ticks and mosquitoes in the summer, both of which are carriers of serious diseases. As they feed on blood, ticks can inject bacteria that cause or . They can also transmit a parasite that causes . Symptoms of illness should be promptly evaluated by a physician.

Insect repellent can help protect you from diseases transmitted through bug bites.

Mosquitoes can carry numerous viruses that are injected into the bloodstream while they take a blood meal. Common mosquito-borne viruses in the U.S. include , and . In most cases, these viruses produce flu-like symptoms that typically resolve on their own. Infection with Zika virus during pregnancy, however, can lead to , and West Nile virus can cause acute fever and neurological effects in some people.

To , wear insect repellent and keep your skin covered whenever possible. Wear light colors so the insects are more visible to you. Ticks like shade and high grass, so mow your lawn down to about 2 inches in height. Be sure to inspect your body and scalp for ticks after being outside.

It is important to pay attention to local news reporting outbreaks of infectious agents in your area or travel destination. With these precautions in mind, you’re sure to have a terrific time, uninterrupted by the germs of summer.

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