A teenage boy who died after contracting meningitis has been described as "funny and kind hearted" by his family.
Lewis Waters, a sixth-form pupil at The Henley College in Oxfordshire, died earlier this week.
Posting a tribute on Facebook, his family said they were "devastated" and "words simply can't describe the heartbreak and upset we're going through".
Two pupils, one from Reading Blue Coat School and another from Highdown Secondary School and Sixth Form Centre in Reading, are also being treated for meningitis, the UK Health Security Agency (UKHSA) has said.
Lewis' dad Sean wrote: "Within a few hours of feeling a bit ill he developed sepsis and was taken from us.
"He fought hard and was really taken care of by the ICU team but they just couldn't save him."
He said the family were "absolutely devastated" and described Lewis as "funny, sociable, kind hearted".
"He also loved his sisters, friends and family dearly," he added.
The UKHSA announced on Thursday that it had identified a social network that connected Lewis and the other two young people.
Close contacts linked to all three are being offered antibiotics as a precaution.
A statement from The Henley College said its "thoughts and sincere condolences are with the student's family and friends at this extremely difficult time".
"We are supporting those affected within our college community and are following the advice and guidance given by the UKHSA," it added.
The UKHSA said one case had been confirmed as Meningitis B (MenB) and it was awaiting further tests on the other two.
It confirmed the case was not the same strain found in MenB outbreaks earlier this year.
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 the risk to the wider public was low.
Highdown School and Sixth Form Centre's head teacher Laura Mathews confirmed it too had shared information with students and parents about signs and symptoms of meningitis.
"Our thoughts are with all those affected," she added.
Pete Thomas, the headmaster of Reading Blue Coat School, said it was "a concerning time for families and the wider community."
He added: "We are deeply saddened by the news of the death of a student at another local school, and our thoughts are with their family, as well as with all those affected during this difficult time."
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 were 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.
Dr Tom Nutt, chief executive of the charity Meningitis Now, urged people "to remain vigilant and aware of the signs and symptoms of the disease".
But he said only infants had been vaccinated against MenB since 2015.
"We believe all teenagers and young adults should be protected by this vaccine on the NHS," he added.
"The MenB vaccine is not available to teenagers and young adults on the NHS routine immunisation schedule, but we believe it should be."
A Department of Health and Social Care spokesperson said it had asked the Joint Committee on Vaccination and Immunisation (JCVI) for an "updated recommendation" based on the latest evidence on MenB.
"The JCVI is carrying out a review of eligibility for routine MenB vaccination and will provide a further update and advice to the department in due course," they said.
"The UK has a world-leading national immunisation programme which is regularly reviewed and updated to reflect the changing nature of infectious diseases and provide the best protection and outcomes for the public."
