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Beaches are still closed due to the Portuguese Man o'war or the floating terror as they say. Still some people choose to go into the water. 11 year old boy was hospitalized on Sunday because he was stung. He was released quite fast, it wasn't that dangerous hit fortunately, but it is apparently very painful.

According to Wikipedia "the dactylzooids make up the tentacles that are typically 10 m (33 ft) in length, but can reach over 30 m (98 ft)." So it's quite hard to avoid them if you are in the water with them. 

"One of the problems with identifying these stings is that the detached tentacles may drift for days in the water, and the swimmer may not have any idea if they have been stung by a man o' war or by some other less venomous creature. Detached tentacles and dead specimens (including those that wash up on shore) can sting just as painfully as the live organism in the water and may remain potent for hours or even days after the death of the organism or the detachment of the tentacle."

"Stings usually cause severe pain to humans, leaving whip-like, red welts on the skin that normally last two or three days after the initial sting, though the pain should subside after about 1 to 3 hours (depending on the biology of the person stung). However, the venom can travel to the lymph nodes and may cause symptoms that mimic an allergic reaction including swelling of the larynx airway blockage, cardiac distress, and an inability to breathe (though this is not due to a true allergy). Other symptoms can include fever and shock, and in some extreme cases, even death, although this is extremely rare. Medical attention for those exposed to large numbers of tentacles may become necessary to relieve pain or open airways if the pain becomes excruciating or lasts for more than three hours, or breathing becomes difficult. Instances where the stings completely surround the trunk of a young child are among those that have the potential to be fatal."

But during the last 110 years in the Mediterranean region only 4 people have died by a Portuguese Man o'war, but during 100 years 20 people have been killed by a shark.