Ashlee Dahlberg, from Indiana, US, says she felt her son Liam's 'heart fade away' after he suddenly contracted a bacterial ...

The family of Liam Dahlberg is urging parents to make sure their children are protected against the aggressive illness ...

Ashlee Dahlberg said it all started when her 8-year-old son, Liam, came home from school with a headache in April.

The Indiana school boy had complained of one symptom before he tragically was declared brain dead within 24 hours.

His Indiana mom said her son was immunocompromised and came into contact with an unvaccinated child at his school.

"This is not your typical everyday flu," said Ashlee Dahlberg of Haemophilus influenzae ... Dahlberg said Liam was vaccinated, but Yancy said the boy most likely contracted H.

GoFundMe screengrab An 8-year-old boy contracted ... mom said. Ashlee Dahlberg, of Lowell, is now imploring parents to vaccinate their children following the April 28 death of her son, Liam ...