A junior school pupil is being treated for meningitis in Reading, the UK Health Security Agency (UKHSA) has said.
The Westwood Farm Junior School pupil is the fourth young person to contract the infection, with all four linked to the same wider social network, the UKHSA said.
Last week, Lewis Waters, who attended The Henley College in Oxfordshire, died with the infection.
Two others cases were reported in Reading - at Reading Blue Coat School and Highdown Secondary School and Sixth Form Centre.
The UKHSA said the Westwood Farm pupil was "recovering well" and confirmed close contacts linked to all four had been offered antibiotics as a precaution.
The UKHSA has not given fuller details on what links the cases.
It said all had been confirmed to be Meningitis B (MenB).
It added the risk to the wider public remained low and this is not linked to incidents in Kent or Dorset.
Two months ago, two people died of MenB in Kent, linked to a nightclub in Canterbury, and in April, three young people contracted meningitis in Dorset.
The agency said it was sharing information about the infection with students and parents at all affected schools.
Lewis Waters was described as "funny and kind hearted".
Posting a tribute on Facebook last week, his family said they were devastated and "words simply can't describe the heartbreak and upset we're going through".
His father Sean Waters said Lewis developed sepsis "within a few hours of feeling ill".
"He fought hard and was really taken care of by the ICU team, but they just couldn't save him," he wrote.
"We are absolutely devastated."
There are about 300 to 400 cases of meningococcal disease diagnosed in England every year.
It is most common in babies, young children, teenagers, and young adults.
Meningitis symptoms can develop suddenly - and can include:
The UKHSA said young people should check they are up to date with vaccinations, including the MenACWY vaccine offered to pupils in Years 9 and 10.
It remains free on the NHS for people until the age of 25 but does not protect against all strains of meningitis.
The UKHSA said other strains, like MenB, can circulate among young people.
