1Lim WS, Macfarlane JT, Cohhorpe CL, et al. Pneumonia and pregnancy. Thorax ,2001,56:398-405.
2Goodnight WH, Scoper DE. Pneumonia in pregnancy. Crit Care Care Med, 2005,33 : $390 -$397.
3Zarocostas J. World Health Organization declares A (H1N1) influenza pandemic. BMJ,2009,338 : b2425.
4Centers for Disease Control and Prevention: Fluview week 34: Pneumonia and Influenza ( P&I ) mortality surveillance [ EB/OL 1. http ://www. cdc. gov/flu/weekly/index, htm # MortalityData, 2009 - 09 -09.
5Itoh Y, Shinya K, Kiso M, et al. In vitro and in vivo characterization of new swine-origin H1N1 influenza viruses. Nature, 2009,460: 1021-1025.
6Chesnutt AN. Physiology of normal pregnancy. Crit Care Clin ,2004, 20:609-615.
7Wise RA, Polito A J, Krishnan V. Respiratory physiolosie changes in pregnancy. Immunol Allergy Clin North Am,2006,26:1-12.
8Lederman MM. Cell-mediated immunity and pregnancy. Chest, 1984,86:6S-9S.
9Wegmann TG, Lin H, Guilbert L, et al. Bidirectional cytokine interactions in the maternal-fetal relationship:Is successful pregnancy a TH2 phenomenon? Immunol Today, 1993,14:353-356.
10Simonsen L, Clarke M J, Sehonberger LB, et al. Pandemic versus epidemic influenza mortality : A pattern of changing age distribution. Infect Dis, 1998,178:53-60.
