On January 30, 2020 WHO declared a global health emergency because of the emerging COVID-19 virus. With multiple cities in China under quarantine, now seems like a good time to look at transmission routes. Though people around the world may sanitize hands and don face masks, there are avenues of transmission that are difficult to avoid. Healthcare providers, and healthcare facilities are among these.
So many points of contact exist in the healthcare system that I have to limit my discussion here to only three that may serve as fomites. A fomite is an inanimate object that transmits disease-causing microorganisms.
The three I will briefly consider are pretty basic for most people who use healthcare facilities: stethoscopes, ambulances (ground, not air) and hospital textiles (sheets/privacy curtains). Of the three,stethoscopes have been the subject of the most research. Despite the long-established fact that stethoscopes can transmit disease, there is an alarming lack of concern about this among many healthcare professionals. And, even when protocols are followed, cleaning is not 100% effective.
As the studies cited below reveal, however, protocols generally are not followed.
The European Journal of Public Health published the results of a meta analysis
(2018) of stethoscopes as fomites. The conclusion: "Stethoscopes
have an high contamination of microorganisms. Some of them are also
involved in Hospital Acquired Infections." The authors of the study
suggest that the absence of standardized protocols in healthcare
facilities, across the world, leads to the transmission of disease.
Saudi Arabia
A study carried out in the King Fahd Hospital of the University in Saudi Arabia looked at cleaning protocols employed by healthcare workers. The "gold standard" of sanitizing a stethoscope is "swiping using alcohol pads", before and after each patient. How common is this practice? The chart below was derived from the Saudi study.
100 stethoscopes were collected and cultured. 70% were free of microorganisms. 30% were contaminated. Seven of the contaminated instruments tested positive for E. coli. Two had Klebsiella, nine had S. epidermis, and twelve had gram positive bacilli.
E. coli
GIF adapted (by me) from a video credited to Taute K, Gude S, Tans S, Shimizu T. Used under a CC 4.0 license
United States
In a study conducted at the U. of Pennsylvania Perelman School of Medicine, stethoscopes used in the ICU were cultured. The findings: multiple pathogens, including: "Staphylococcus (including S. aureus); Pseudomonas; Acinetobacter; Clostridium; Enterococcus; Stenotrophomonas; and Burkholderia."
A surprising finding (to me): even after cleaning not all stethoscopes tested as 'clean'.
Pseudomonas
Nigeria
1800 stethoscopes were cultured. The following pathogens were detected: "Escherichia coli (10.0%), Proteus Mirabilis (8.33%), Proteus vulgaris (6.70%), Pseudomonas aeruginosa (23.3%), Staphylococcus aureus (0.83%), Streptococcus spp. (18.3%), E. faecalis (3.33%), Coagulase negative staph (28.3%) and Salmonella choleraesius (0.83%)."
Canada
A 2011 study (published by Cambridge.org) came up with the following results: of 110 stethoscopes collected from 3 emergency room departments: "Fifty-four specimens grew coagulase-negative sta-phylococci and one grew methicillin-susceptible S.aureus. No MRSA was cultured." Questionnaires were handed out that inquired about cleaning practices. Findings: only 8% of the respondents ("all nurses") reported cleaning the stethoscope after each patient.
Multinational
An essential, often unavoidable link between healthcare consumers and healthcare providers is the ambulance. An article published in the Journal of the American Society for Microbiology (2017) looks at ambulances as fomites. The authors of the article explain that while disease transmission in hospitals (nosocomial transmission) has been studied extensively, this is not true for EMS--ambulance services. The authors state: "Our review provides evidence that EMS microbiomes are dynamic and important pathogen reservoirs." In other words, traveling in an ambulance can make you sick. EMS workers themselves are also at risk, and may be carriers of disease contracted in their vehicles.
The study cited in this article looked at data from eight countries: United States, Australia, Saudi Arabia, Germany, Denmark, Thailand, United Kingdom and South Korea. While a variety of pathogens were identified in ambulances (ground, not air) from different countries, only ambulances in the U. S. and Germany tested positive for MRSA. And in those tests, the U.S had a much higher occurrence.
The authors of the article are quick to point out that the U.S. has far less stringent protocols for handling MRSA patients than does Germany, or the other countries included in the study.
The article concludes with this assessment: EMS workers have to be better educated about pathogens and modes of transmission; decontamination procedures must be improved; and these enhanced procedures are essential to meet emerging challenges of "biological threats, bioterrorism and epidemics."
Egypt
A multi-center study looked at twenty-five vehicles. Sixteen "selection points" were swabbed in each vehicle. The results: "589 bacteria were isolated and 286 (48.6%) of the isolates were potentially pathogenic. The highest contamination rate with pathogenic bacteria was detected in suction devices (75.8%) and stethoscopes (67.7%)." The usual suspects, staphylococci, Klebsiella, E. Coli, Citrobacter spp. and Proteus spp. were detected. Several cultured pathogens were methicillin resistant. The authors of the study conclude that even before patients get to the hospital they may contract multidrug-resistant infections. Just from riding in an ambulance.
The United States (Specifically Oxygen Canisters)
The Journal of Emergency Medicine published the results of a study that looked at methicillin-resistant Staphylococcus aureus on oxygen canisters in ambulances. The results: nine out of nine canisters cultured tested positive for MRSA. Off-site, in a facility where the canisters were stored, 67 out of 70 cultured positive for MRSA. The study concludes: "Oxygen cylinders appear to act as a fomite for MRSA".
This one really got me. A lot of attention is paid to hard surfaces in healthcare facilities. But how about those curtains we casually pull aside for privacy. Or, how about the sheets we must sleep on?
One article I found in Infection Control Today considers "healthcare textiles and other soft surfaces" as fomites.
Privacy Curtains
With regard to privacy curtains:
The authors of the article state that even when cleaning does occur
(which is not often the case) dangerous pathogens remain and may be
passed on to patients and/or healthcare workers. The pathogens include:
Clostridium difficile; vancomycin-resistant enterococci (VRE); methicillin-resistant Staphylococcus aureus (MRSA); Acinetobacter baumannii; and Pseudomonas aeruginosa.
The results of a survey about cleaning protocols for privacy curtains: out of fifty respondents, 37 percent (14/38) of the facilities surveyed cleaned ‘only when visibly soiled’; 13 percent (5/38) cleaned ‘every month’; 13 percent (5/38) ‘every 3 months’ and, remarkably, 13% cleaned them only once a year!
Sheets
A 2018 study
out of the UK had some disturbing findings. Even after being
commercially laundered according to healthcare industry standards, some
sheets still carried C. difficile, which is a persistent and
difficult to treat pathogen. The authors of this study suggest that
endurance through cleaning might explain some C. difficile outbreaks among patients and healthcare workers.
Finally, another study suggests that pathogens from sheets in a laundry room could be aerosolized. Workers are infected with these air-borne pathogens. The workers then may transmit disease through a facility.
In Conclusion
Whatever the outcome of the current coronavirus alarm, it is certain
that transmission vulnerabilities exist in the healthcare system...in
all healthcare systems. This is partly due to ineffective methodology,
but mostly due, it seems, to human failure. Healthcare workers must be
better educated and more diligent in applying established protocols.
Thank you for reading my blog
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