Fig. 1From: Perinatal listeriosis patients treated at a maternity hospital in Beijing, China, from 2013–2018The annual and seasonal numbers of pregnancy-associated listeriosis cases from 2013 to 2018. a Annual number of perinatal listeriosis infections. b Seasonal number of perinatal listeriosis cases. Spring (March, April, May), summer (June, July, August), fall (September, October, November), and winter (December, January and February)Back to article page