tetano
Editor, Senior Moderator
J Infect Chemother
. 2023 Nov 6:S1341-321X(23)00268-4.
doi: 10.1016/j.jiac.2023.10.023. Online ahead of print. Levels of environmental contamination with SARS-CoV-2 in hospital rooms and salivary viral loads of patients with coronavirus disease 2019
Hidehito Matsui[SUP] 1 [/SUP], Yusuke Suzuki[SUP] 2 [/SUP], Sohei Nakayama[SUP] 2 [/SUP], Takanori Asakura[SUP] 2 [/SUP], Osamu Takeuchi[SUP] 2 [/SUP], Kaori Kusatsugu[SUP] 2 [/SUP], Chihiro Ueda[SUP] 3 [/SUP], Eri Nakajima[SUP] 3 [/SUP], Yumiko Suzuki[SUP] 1 [/SUP], Harumi Endo[SUP] 1 [/SUP], Miho Sugamata[SUP] 1 [/SUP], Yukiko Takarabe[SUP] 1 [/SUP], Yukie Yamaguchi[SUP] 1 [/SUP], Kazuhito Horie[SUP] 2 [/SUP], Yoshikazu Kobayashi[SUP] 2 [/SUP], Satoshi Kuronuma[SUP] 2 [/SUP], Yasuo Imoto[SUP] 3 [/SUP], Hideaki Hanaki[SUP] 4 [/SUP]
Affiliations
Background: Clarifying the presence of viable severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) rather than SARS-CoV-2 viral RNA in inpatient rooms is important for infection control of coronavirus disease 2019 (COVID-19). In this study, we investigated levels of viral RNA and viable virus on environmental surfaces and in patient saliva.
Methods: Environmental samples from 23 sites in hospital rooms were collected every other day until patient discharge. Saliva specimens and samples from the inner surface of patient masks were also collected. Additionally, environmental samples were collected from 46 sites in hospital rooms on discharge day. The samples were examined using quantitative reverse transcription polymerase chain reaction (RT-qPCR) and plaque assays.
Results: The 10 enrolled cases were classified as mild COVID-19, and patients were discharged after 6-9 days. The viral RNA was detected in 12.4% (105/849) of serially collected environmental samples during hospitalization, whereas viable virus was detected only in 0.47% (4/849), which were from sinks and tap levers. Although all patients recovered, three cases retained viable virus in the last saliva specimen collected. In the 15 discharged rooms, viral RNA was detected in 6.6% (45/682) of the samples, and viable virus was detected in only one sample from the sink.
Conclusions: Although environmental surfaces surrounding patients with COVID-19 were frequently contaminated with viral RNA, the presence of viable virus was rare and limited only to areas around sinks. These results suggest that contact infection risk via fomites in hospital rooms is extremely rare.
Keywords: COVID-19; Environmental contamination; SARS-CoV-2.
. 2023 Nov 6:S1341-321X(23)00268-4.
doi: 10.1016/j.jiac.2023.10.023. Online ahead of print. Levels of environmental contamination with SARS-CoV-2 in hospital rooms and salivary viral loads of patients with coronavirus disease 2019
Hidehito Matsui[SUP] 1 [/SUP], Yusuke Suzuki[SUP] 2 [/SUP], Sohei Nakayama[SUP] 2 [/SUP], Takanori Asakura[SUP] 2 [/SUP], Osamu Takeuchi[SUP] 2 [/SUP], Kaori Kusatsugu[SUP] 2 [/SUP], Chihiro Ueda[SUP] 3 [/SUP], Eri Nakajima[SUP] 3 [/SUP], Yumiko Suzuki[SUP] 1 [/SUP], Harumi Endo[SUP] 1 [/SUP], Miho Sugamata[SUP] 1 [/SUP], Yukiko Takarabe[SUP] 1 [/SUP], Yukie Yamaguchi[SUP] 1 [/SUP], Kazuhito Horie[SUP] 2 [/SUP], Yoshikazu Kobayashi[SUP] 2 [/SUP], Satoshi Kuronuma[SUP] 2 [/SUP], Yasuo Imoto[SUP] 3 [/SUP], Hideaki Hanaki[SUP] 4 [/SUP]
Affiliations
- PMID: 37940039
- DOI: 10.1016/j.jiac.2023.10.023
Background: Clarifying the presence of viable severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) rather than SARS-CoV-2 viral RNA in inpatient rooms is important for infection control of coronavirus disease 2019 (COVID-19). In this study, we investigated levels of viral RNA and viable virus on environmental surfaces and in patient saliva.
Methods: Environmental samples from 23 sites in hospital rooms were collected every other day until patient discharge. Saliva specimens and samples from the inner surface of patient masks were also collected. Additionally, environmental samples were collected from 46 sites in hospital rooms on discharge day. The samples were examined using quantitative reverse transcription polymerase chain reaction (RT-qPCR) and plaque assays.
Results: The 10 enrolled cases were classified as mild COVID-19, and patients were discharged after 6-9 days. The viral RNA was detected in 12.4% (105/849) of serially collected environmental samples during hospitalization, whereas viable virus was detected only in 0.47% (4/849), which were from sinks and tap levers. Although all patients recovered, three cases retained viable virus in the last saliva specimen collected. In the 15 discharged rooms, viral RNA was detected in 6.6% (45/682) of the samples, and viable virus was detected in only one sample from the sink.
Conclusions: Although environmental surfaces surrounding patients with COVID-19 were frequently contaminated with viral RNA, the presence of viable virus was rare and limited only to areas around sinks. These results suggest that contact infection risk via fomites in hospital rooms is extremely rare.
Keywords: COVID-19; Environmental contamination; SARS-CoV-2.