“…In contrast, although we observed a measurable increased risk of infection with the second-generation DMTs, in particular for natalizumab, none of the short-term clinical trials for these drugs (natalizumab, fingolimod or dimethyl fumarate) reported significant increased infection rates 31–36. While the number of people on these drugs in our study was modest, with the phase III randomised clinical trials often including more individuals, still, concerns regarding infection risk have been raised, including in an independent review of trial data,37 and within the relevant product monographs. Since these drugs were approved, much focus has been on the relatively rare, but serious, progressive multifocal leukoencephalopathy 38.…”