"No one who has not already been identified and contacted needs antibiotics.
"The risk to students at this time is very low. There is no need for anyone to remain off college or not continue with usual activities."
The number of active cases in Kent has fallen from 23 to 20, while suspected cases under investigation have also dropped from 11 to nine, with total cases down from 34 on Saturday to 29 today.
The UKHSA said: “Some cases initially classified as confirmed cases have been reclassified following further laboratory results and clinical investigation.
“As further laboratory assessments are completing, we expect some further probable cases to be downgraded in the coming days.”
Among the current 20 confirmed cases, 19 are classified as meningitis B and all cases have resulted in hospital admission.
Dr Sherine Thomas, infectious diseases consultant at UKHSA, said: “We continue to remain vigilant for new cases and work closely with NHS England and local authorities across the country to ensure that any new cases identified are responded to as quickly as possible.
“It’s reassuring to have seen so many eligible young people come forward for antibiotics and vaccination, and we’d like to thank everyone involved in this effort so far.
“Although the risk to the wider population remains low, it is still really important that people know the symptoms of invasive meningococcal disease and seek immediate medical attention if they or anyone they know develops them. UKHSA continues to work with partners to identify contacts and offer necessary treatment.”
