Visitors to a famous sex club in Berlin have been urged to seek medical treatment after a clubber was taken ill with bacterial meningitis.

The KitKat Club said the man was in a serious condition in hospital after attending a party on Saturday night.

“Unfortunately, the sick guest is very bad, so it was not possible to ask who he had closer contact with at the club,” it said on its Facebook page. Instead it asked anyone who experienced sudden chills, fever or a nasal infection to seek immediate help.

“While infections in the club were very unlikely according to doctors and authorities... anybody suffering from symptoms should immediately see a doctor,” it added.

The club said that none of its employees had shown any symptoms so far, but all had been offered antibiotics as a preventive measure.

If left untreated, bacterial meningitis can cause life-threatening blood poisoning or sepsis.