BROWARD COUNTY, Fla. -- A man, who remains in critical condition after being bitten by a poisonous snake, may have no family or connections in South Florida.

Damian Hernandez Rubio, 31, was bitten last Thursday. Pembroke Pines police were dispatched to Pines Lakes Elementary School, where Rubio, 31, was behaving strangely. As police were taking Rubio into custody, they noticed his breathing was interrupted and at one point stopped completely.

Memorial Hospital West doctors determined that he had been bitten in the hand by some type of poisonous snake.

Local 10 has learned that no one has responded to the media coverage of Rubio's hospitalization. His identification indicates that he is from Nuevo Laredo, Mexico, near Laredo, Texas, and it is believed that he may have been in South Florida as a day worker.

Police searched the area near the school, but were unable to find the snake. Without identifying the snake, it is impossible to know what type of antivenin should be used to treat Rubio.

"In this case, he doesn't seem to be responding to the proper treatment of snakes native to the United States, so we're leaning to believe that it may be from another part (of the world)," said Miami-Dade fire-rescue Capt. Al Cruz with the anti-venom unit. "We carry 43 different anti-venoms that cover 98 percent of all the world's venomous snakes."

Cruz said that he believes the snake might have been Rubio's pet. He said that of the more than 400 snakebite victims the anti-venom unit has treated, Rubio's case is one of the top five worst. Rubio has been treated with more than 50 vials of antivenin -- more than four times the average dose.