NSW Health director of communicable disease, Vicky Sheppeard, said 115 children had been admitted to Children's Hospital Westmead with flu this year, including two needing critical care

"With flu cases still on the rise, we're encouraging everyone, particularly pregnant women and parents of young children, to get their flu shots immediately," Dr Sheppeard said.

The latest weekly Influenza Surveillance Report shows 3796 flu cases for the week ending June 16, up from 3288 notifications the previous week and one additional death of a person over 65 years, bringing the annual total to 50 confirmed deaths.

In the Murrumbidgee Local Health District, there were 142 new flu cases reported in that week, slightly down on the 155 reported for the previous seven days.

Dr Sheppeard said 2.37 million doses of government-funded flu vaccines have been distributed across NSW, including over 176,000 doses for children aged six months to three years, and 1.17 million doses for people 65 years and over.

"There has been strong demand, but there are sufficient supplies of free government-funded vaccines available for eligible people.

"So we are again encouraging parents and carers of children from six months up to five years old to take advantage of the free flu vaccine.

"If you are unwell with the flu, stay at home and minimise contact with other people if possible, especially those who are particularly vulnerable, such as young children and the elderly. Avoid visiting aged care facilities and child care centres until you have recovered," Dr Sheppeard said.