Type 2 Poliovirus Detection after Global Withdrawal of Trivalent Oral Vaccine.
Blake IM, Pons-Salort M, Molodecky NA, Diop OM, Chenoweth P, Bandyopadhyay AS, Zaffran M, Sutter RW, Grassly NC.
N Engl J Med. 2018 Aug 30;379(9
https://www.nejm.org/doi/full/10.1056/NEJMoa1716677