. . "Encyclopedia of Virology" . "2008-07-30"^^ . "Elsevier; PMC" . "Vaccine Strategies" . . "no-cc" . "Almond, J.W." . "10.1016/b978-012374410-4.00597-5" . . "Van Regenmortel, Marc" . . "Mahy, Brian" . "PMC7150003" . . . . "Kusters, I." .