Bayesian phylogenetic tree based on the full-length HN CDS sequence of HPIV1–4. Fig. (A–D) correspond to the trees of HPIV1, HPIV2, HPIV3, and HPIV4, respectively. The prototype strains, the strains obtained in this study, and other Chinese strains are indicated by blue triangles, red solid circles, and red pentagrams, respectively. The names of the strains include the GenBank number, serotype, country of isolation, name, and year of the collection. The country abbreviations ARG, AUS, BRA, CHE, CHN, DEU, ESP, FRA, GBR, HRV, ITA, IND, JPN, KEN, KOR, MEX, MYS, NLD, PER, RUS, SAU, THA, UGA, USA, VNM, ZAF, and ZAM in the trees represent Argentina, Australia, Brazil, Switzerland, China, Germany, Spain, France, the United Kingdom, Croatia, Italy, India, Japan, Kenya, South Korea, Mexico, Malaysia, the Netherlands, Peru, Russia, Saudi Arabia, Thailand, the Republic of Uganda, the United States, Vietnam, the Republic of South Africa, and the Republic of Zambia, respectively.