母
子
垂
直
感
染
m
ú
m
ǔ
z
ǐ
z
ǐ
c
h
u
í
c
h
u
í
z
h
í
z
h
í
g
ǎ
n
g
ǎ
n
r
ǎ
n
r
ǎ
n
Definitions
1. mother-to-infant transmission
Components
母子
mǔ zǐ
–
mother and child
垂直
chuí zhí
–
perpendicular
感染
gǎn rǎn
–
infection