'Once you identify cases, as quickly as possible, you vaccinate those close contacts of that case, and, if you have enough vaccine and enough resources, the contacts of the contacts.'
'There's enough of a vaccination period relative to the amount of time that the vaccine needs to develop immunity that you can do what's called 'ring vaccination',' he told CTV News. Matthew Oughton says existing vaccines are very effective against the virus, as long as it's given early enough. The vaccine is being delivered to people who were in close contact with the 25 confirmed cases. Montreal public health has started its vaccination campaign to limit the spread of the newly-arrived monkeypox virus.