In Harrow, between January 2023 and December 2025, there was an average of 105 people per year diagnosed with active TB.
It has the second highest number of active cases per borough in England, according to the National TB Surveillance System.
Rates have increased year on year since January 2019, when incidents were at their lowest.
Harrow’s public health data shows that, of those eligible for latent TB screening, 35% were screened and of those, 10% completed treatment.
Gibson told a health and social care scrutiny meeting that they “don’t know why this is” but understanding it would form a “vital part” of creating an action plan.