A warning has been issued for locations across the Sutherland Shire after a child was diagnosed with the highly infectious virus measles.

Westfield Miranda, Sylvania Heights Community Club and, Sutherland Hospital Emergency Department and Sydney Children's Hospital Emergency Department are those identified by South Eastern Sydney Local Health District as locations attended by the child while infectious.

Dr Vicky Sheppeard warns that measles can affect children and adults alike.

In an alert released on Saturday, the district's Public Health Unit warned people who have recently been at any of the locations to watch for any measles symptoms and consult their GP immediately if any are found.

"Symptoms include fever, sore eyes and a cough followed three or four days later by a red, blotchy rash spreading from the head and neck to the rest of the body," said Dr Catherine Bateman-Steel, Acting Director Public Health, South Eastern Local Health District.