“A 3-month-old male infant with no underlying diseases was admitted to Beijing Haidian Hospital on July 31, 2015, where he was diagnosed with lobular pneumonia exactly 26 days after he had received his second dose of trivalent OPV (tOPV). The infant was born from a second regular pregnancy by normal delivery (35/36 weeks gestation, birth weight: 3550 g). The infant also received two birth dose vaccinations (the Bacillus Calmette–Guerin vaccine and hepatitis B vaccine), and no adverse reactions to the vaccinations were reported. The infant had no signs of immunodeficiency. His family had no history of travel in the months before he became ill.” 

Chinese Medical Journal 2017