Investigation on the influence of negative pressure level in infection ward on SARA-CoV-2 nucleic acid contamination on object surface
Objective To understand the influence of different negative pressure levels on the SARS-CoV-2 nucleic acid contamination on the surface of objects in infection ward.Methods The negative pressure ward infected with SARS-CoV-2 in a medical institution was selected as the investigation object,and the air pressure difference inside and outside the ward were detected.The SARS-CoV-2 nucleic acid was sampled on the bed railing,floor,sink and toilet in the ward,and the viral nucleic acid pollution was detected.Results The negative pressure difference between the infection wards on two floors was(20.96±0.57)and(6.49±0.90)Pa(t=113.348,P<0.001),both of which met the requirements of GB/T 35428-2017(negative pressure difference≥5 Pa);The detection rates of positive samples on the corresponding floors were 16.41%and 16.97%,respectively(χ2=0.020,P=0.887).The positive sample detection rate in the living room of the low negative pressure ward was 23.23%,which was higher than that in the restroom(7.58%)(χ2=6.889,P=0.009);There was no statistically significant difference in the detection rate between the two areas in the high negative pressure ward(P>0.05).The detection rate of ground positive samples in low negative pressure wards was higher than that in high negative pressure wards(27.27%vs 7.69%;χ2=4.934,P<0.05).Conclusion The negative pressure difference has no obvious effect on the overall distribution of SARS-CoV-2 pollution in infection wards.The cleaning and disinfection of toilets,especially the floor,should be emphasized in low negative pressure wards.
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