According to a new study, due to the increased risk of seizures being brought on by an influenza infection, children with a severe form of epilepsy should receive the flu vaccine.

The risk of severe neurological symptoms and complications, such as worsening seizures, declining language, and motor skills, and even death after contracting the flu, made the research, led by the Murdoch Children's Research Institute and the University of Melbourne, conclude that the safe administration of the seasonal influenza vaccine should be a priority in people with SCN1A-positive Dravet syndrome.

The choice for parents to vaccinate children with this syndrome is complicated, according to paediatric neurologist Dr Katherine Howell of Murdoch Children's, because seizures can be brought on by both infection and immunisation.

Despite the syndrome being linked to the high incidence of protracted seizures during infections, according to Dr Howell, the effects of influenza had not yet been researched.

Children with SCN1A-positive Dravet syndrome who had a confirmed flu infection at The Royal Children's and Austin Hospital participated in the study, which was written about in Neurology. Researchers discovered that 21 kids contracted the flu 24 times, with brain problems occurring in 88 per cent of those cases.

All presented to the hospital with 75 per cent recovering quickly but death or long-term brain complications occurred in one in five infections. Between them, they received 60 influenza vaccinations with most tolerating the vaccine well.

"Concerns about giving the flu vaccine and incomplete routine immunisations are common in this patient group due to the risk of seizures after vaccination," Dr Howell said. However, because this syndrome is also associated with a high risk of seizures during infections, it highlights the critical need to protect patients from the complications of vaccine-preventable infections like the flu.

Our research highlights that the benefits of flu vaccines for these children far outweigh the risks of seizures being triggered following vaccination. One in 15,000 children has the most prevalent severe form of hereditary epilepsy, SCN1A-positive Dravet syndrome. A boy from Melbourne had seizures as a newborn and was later identified with SCN1A-Dravet syndrome.

Renae reported that her kid now receives an annual flu vaccination to avoid having lengthy seizures, which are typically brought on by an illness. Fraser needed four days in the hospital for treatment after having a two-hour seizure at the age of 11 months due to the virus.

"The seizures have gone from monthly to weekly, but they are much shorter now, resolving after a few minutes rather than a couple of hours," she said. But if he has a viral infection he will seize for as long as his temperature is high and may need a lot of medication and even intubation to get his seizures under control.

"It can take Fraser up to four days to get back to normal after he experiences a severe seizure so anything we can do to avoid him getting sick we will do." Renae said all his influenza vaccines had been well-tolerated with no seizures.

"The research is reassuring for parents that it's beneficial for children with this condition to have the flu shot to try and avoid an onset of seizures caused by an infection, which are damaging and terrifying to watch," she said. University of Melbourne Professor Ingrid Scheffer said the findings would change clinical practice.

"Identifying safe strategies and strongly encouraging influenza vaccination in children and adults with SCN1A-Dravet syndrome is critical," she said.

"Prior to influenza vaccination, vaccine providers should review the child's regular anti-seizure medications and ensure a seizure management plan is in place. The use of additional anti-seizure medications in the post-vaccination period, such as benzodiazepines, is now recommended to reduce the risk of seizures following a vaccine and is becoming routine practice."