evidence: Second, the Pfizer vaccine has been used in 164 countries, while monkeypox has occurred in 88. That’s a difference of 76 countries. A quick comparison of the more credible maps on the vaccine tracker and CDC website shows that some cases of monkeypox have been reported in countries where the Pfizer vaccine wasn’t rolled out. And some places that have used the vaccine haven’t had any cases of the disease. Places where the Pfizer vaccine has been used, but no monkeypox reported, include Afghanistan, French Guiana, Guyana, Mongolia, Pakistan, Paraguay, Turkmenistan, Ukraine and Western New Guinea.