Six members of the Double Bay Public School community were struck down with salmonella poisoning following a Year 6 farewell event.

South Eastern Sydney Local Health District (SESLHD) public health unit director Mark Ferson confirmed the illnesses were linked.

An excerpt from the school’s Week 4 newsletter, written by principal Andrea Garling, said those who fell ill included students and staff.

Prof Ferson said the public health unit had been alerted to the December, 2014, incident following lab notifications of a particular strain of salmonella linked to the school event.

Due to privacy concerns he would not provide specific details of patient symptoms or treatment.