[Primary respiratory syncytial virus infection in mice].
OBJECTIVE
To establish a mice-model of primary respiratory syncytial virus infection.


METHODS
Twelve Balb/c mice (8-12 w) were divided into two groups with three different titers of RSV infection in the experimental group. Mice were anaesthetized with pentobabitone(30 mg/kg) and infected by nasal drip of 0.1 ml of RSV which was harvested from HEP-2 cell culture. Three mice in the control group received sham infection with HEP-2 cell media. Five days later, lungs were removed in aseptic condition. Right lung was weighted and homoginized with MEM(1:10 ratio), then centrifuged at 4 degrees C, 2,000 r/min for 20 minutes. Supernatants were collected for virus isolation and plaque forming assay. Left lung was collected for histopathological and electromicroscopic examination.


RESULTS
(1) RSV grew with a characteristic syncytial formation in HEP-2 cells, leading to the fusion of cells with round, elliptic, map or tree like shape. (2) Virus was isolated and detected in the lung tissue in experiment group. (3) There was a positive correlation between RSV titer added and that replicated in the lung. (4) After the eclipse phase, viral replication in the lung reached maximum within 4 and 6 days. The most apparent pathological change was found between day 5 and 8. Mononuclear cell infiltration was presented in the perivascular, peribronchial and in the alveoli spacers. (5) Huge viral replication with its fuzzy coat was detected inside the cytoplasm of the type II alveolar lining cell at high magnification.


CONCLUSIONS
An animal model of RSV infection Balb/c mice was successfully established by nasal inoculation with respiratory syncytial virus.
Zou
Y
Y
Guangzhou Institute of Respiratory Disease, Guangzhou 510120, China.
Huang
H
H
Xu
J
J
D000818:Animals; D004195:Disease Models, Animal; D005260:Female; D008168:Lung / Q000473:pathology / Q000821:virology; D051379:Mice; D008807:Mice, Inbred BALB C; D018357:Respiratory Syncytial Virus Infections / Q000209:etiology* / Q000473:pathology / Q000821:virology; D012136:Respiratory Syncytial Viruses / Q000302:isolation & purification / Q000502:physiology; D014779:Virus Replication