Be careful before diving inUpdated 11:44 AM ET, Tue June 28, 2016 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Be careful before diving inSummer can be a time for bacteria and other microbes to flourish, from pools to picnics.Hide Caption 1 of 7 Photos: Be careful before diving inIngredients of potato salad such as potatoes, pasta and eggs -- not mayonnaise -- are prone to contamination. Hide Caption 2 of 7 Photos: Be careful before diving inListeria bacteria like to live in cooler temperatures and populate machinery, such as ice cream dispensers. Hide Caption 3 of 7 Photos: Be careful before diving inIn the most severe cases of sunburn, people can develop blisters and need to be treated like burn victims.Hide Caption 4 of 7 Photos: Be careful before diving inUrine is not an antidote to the venom of a jellyfish. Rinsing the wound with saltwater or using vinegar can be effective.Hide Caption 5 of 7 Photos: Be careful before diving inMold and bacteria love to grow on air conditioning filters, especially in the summer humidity. Hide Caption 6 of 7 Photos: Be careful before diving inSea lice, also known as seabather's eruption, can cause an itchy rash.Hide Caption 7 of 7Get out and enjoy the summer months. But be careful of some dangers that await you at the picnic, pool or beach.More from Health'Modern Family' actress slams body-shamersSarin Fast FactsYour ALS Ice Bucket money goes to... (2015) 1 dead and 9 hospitalized with botulism after eating nacho cheese sauceWhat is botulism, and how does it kill?