Officials combed 52,000 sq ft of ground over six hours in Southampton yesterday in search of an Eastern Diamondback Rattlesnake sighted last month in the Gibbs Hill area, but were unable to track down the reptile.

The Department of Environment and Natural Resources also said a photograph of the snake, supplied by the person who reported the original sighting, is believed to be genuine. No video was provided.

The person has been interviewed by DENR and police “multiple times”, and a search is ongoing.

A spokesman said that, with the sex of the animal unknown, the “reproductive risk cannot be fully dismissed”.

He added: “The public should remain vigilant but not panic.

“Eastern Diamondback Rattlesnakes are defensive, and they do not seek out humans. The greatest risk is from accidental close contact, stepping on or near a concealed snake, approaching too closely or attempting to catch, move or kill it.”

Rapid reporting was said to now be “the most important public action”.

“The safest and most effective public response is immediate reporting, accurate location information and avoiding contact.”

Anyone sighting the rattlesnake should move to a safe distance and call 911 immediately, and avoid approaching or attempting to capture or kill the animal.

If it can be done safely, individuals should note what the snake looked like or take a photograph from a distance.

Anyone bitten should call 911 immediately, move to safety, remain calm and keep the affected limb at about heart level.

They were advised to remove rings, watches or tight clothing. No attempt should be made to cut a bite wound, suck out venom or apply a tourniquet or ice.

Alcohol should be avoided, and no medication, such as aspirin or ibuprofen, should be taken unless directed by a doctor.

Early medical treatment is critical, and every venomous snake bite must be treated as an emergency.