Author: Liu, Wen-Kuan; Liu, Qian; Chen, De-Hui; Liang, Huan-Xi; Chen, Xiao-Kai; Huang, Wen-Bo; Qin, Sheng; Yang, Zi-Feng; Zhou, Rong
Title: Epidemiology and clinical presentation of the four human parainfluenza virus types Document date: 2013_1_23
ID: 1b56a6zc_13
Snippet: HPIVs were identified in 178/4755 (3.7%) samples. Ninety-nine (2.1%) samples were positive for HPIV-3, 58 (1.2%) for HPIV-1, 19 (0.4%) for HPIV-2 and 8 (0.2%) for HPIV-4 (Table 1 ). Some samples were positive for multiple HPIV types, therefore the sum of these segments is more than 178. groups. The large majority (160/178; 88.9%) of HPIVpositive samples were from paediatric patients younger than 5 years old ( Figure 1 ), but no infant under one m.....
Document: HPIVs were identified in 178/4755 (3.7%) samples. Ninety-nine (2.1%) samples were positive for HPIV-3, 58 (1.2%) for HPIV-1, 19 (0.4%) for HPIV-2 and 8 (0.2%) for HPIV-4 (Table 1 ). Some samples were positive for multiple HPIV types, therefore the sum of these segments is more than 178. groups. The large majority (160/178; 88.9%) of HPIVpositive samples were from paediatric patients younger than 5 years old ( Figure 1 ), but no infant under one month of age was HPIV positive. HPIV-3 was isolated from patients aged one month to 78 years. HPIV-3 was isolated predominantly from patients under 5 years of age, and the highest frequency was found in those aged 7-12 months (27/406; 6.7%). HPIV-1 was isolated from patients aged one month to 47 years, and HPIV-2 was isolated from patients aged 2 months to 41 years old. HPIV-1-positive patients were more evenly distributed across ages than HPIV-3-positive patients, but like HPIV-3 the highest frequency of HPIV-1 was detected from patients aged 7-12 months (9/406; 2.2%). HPIV-2 was not isolated as frequently as HPIV-3 or HPIV-1, but the highest frequencies of HPIV-2 were found in patients' age groups of 0-3 months (4/316; 1.3%) and 4-6 months (3/274; 1.1%). Only 8 (0.2%) patients were HPIV-4 positive in this study, and patient age ranged from 5 months to 8 years.
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