A devastated mother is calling for the meningococcal B vaccine to be made available to all children and teenagers, after her 16-year-old son died suddenly last week.

Melbourne mum Norliah Syer-Peterson said her son Levi fell ill with what appeared to be gastro-like symptoms on Tuesday, September 23, before his condition deteriorated rapidly.

Levi, who was a Year 10 student at St Francis Xavier College in Beaconsfield, appeared perfectly happy and healthy in the morning, his mother told 9news.com.au.

"I had dropped him off to do some work with my brother, who is a removalist," Syer-Peterson said.

"We were joking around, and we were talking about how we were going to have a mum and son fun day during the holidays."

However, when Levi came home that afternoon, he complained of having a s

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