The effect of facial hair and sex on the dispersal of bacteria below a masked subject

  title={The effect of facial hair and sex on the dispersal of bacteria below a masked subject},
  author={H. A. Mclure and Madhavi Mannam and C. A. Talboys and B S Azadian and Steve M. Yentis},
Surgical face masks prevent the dispersal of bacteria from the upper airway to surfaces immediately in front of and below the face during talking. However, mask wiggling has been reported to increase dermabrasion and bacterial contamination of surfaces immediately below the face. Facial hair and recent shaving may alter the quantity of particles shed by dermabrasion when the mask is wiggled. We investigated the effect of mask wiggling in 10 bearded and 10 clean‐shaven male subjects, and 10… 
The use of a face mask and avoidance of talking each significantly decreased the dispersion of bacteria, and plates pretreated with povidone–iodine demonstrated the least bacterial growth.
Assessing the effect of beard hair lengths on face masks used as personal protective equipment during the COVID-19 pandemic
Though variable, N95 respirators offer the best respiratory protection for bearded men and KF94 and KN95 FFE is compromised considerably by increasing beard length, they proved better options than procedure and cotton face masks.
To Beard or Not to Beard? Bacterial Shedding Among Surgeons.
Bearded surgeons did not appear to have an increased likelihood of bacterial shedding compared with their nonbearded counter parts while wearing surgical masks, and the addition of nonsterile surgical hoods did not decrease the amount of bacterial shed observed.
Source of bacterial shedding in laminar flow theatres.
Do theatre staff use face masks in accordance with the manufacturers’ guidelines of use?
Most operating theatre staff do not apply a face mask using correct technique, outlined in CDC guidance, which may increase SSI rates, and staff are not aware of existing guidelines for donning a mask.
The effectiveness of surgical face masks: what the literature shows.
There is little evidence that wearing a surgical mask provides sufficient protection from all the hazards likely to be encountered in an acute health care setting: the use of a respirator and face shield should be considered depending on the circumstances.
The effect of alcohol swabs and filter straws on reducing contamination of glass ampoules used for neuroaxial injections *
Wiping ampoules with isopropyl alcohol and using a filter straw should be part of routine practice when performing regional anaesthesia, as filter straws also reduce the risk of injecting glass particles (even if not contaminated).
Microbes and masculinity: Does exposure to pathogenic cues alter women’s preferences for male facial masculinity and beardedness?
Women’s preferences for beards were positively associated with their pathogen disgust, which runs contrary to predictions and may reflect preferences for high quality individuals who can withstand any costs of beardedness, although further replications are necessary before firm conclusions can be made.


Surgical face masks and downward dispersal of bacteria
Analysis of the number of bacterial colonies grown on each agar plate showed a statistically significant reduction in the median number of colonies cultured per plate when the mask was worn, suggesting that for procedures lasting less than 15 min, the operator should wear a face mask.
Surgical face masks are effective in reducing bacterial contamination caused by dispersal from the upper airway.
A fresh face mask almost completely abolished bacterial contamination of agar plates 30 cm from the mouth, and after 15 min there was an increase in the level of contamination which was statistically insignificant.
Human Skin Flora as a Potential Source of Epidural Abscess
In a large proportion of patients, isolation of viable organisms from excised skin specimens after disinfection with 10% PVP-I suggests that contamination of the epidural space by the skin flora may be a potential mechanism of epidural infection associated with epidural block.
Hair as a reservoir of staphylococci
There were more staphylococcal post-operative wound infections in hair carriers than in non-carriers, and in three cases the Staph.
Wearing of masks for obstetric regional anaesthesia
A postal survey of 801 members of the Obstetric Anaesthetists Association was carried out in the United Kingdom and Ireland to investigate the use of surgical facemasks whilst performing spinal and epidural blocks, finding that half of those who routinely wore masks did not believe that wearing a mask reduced the risk of infection.
Carriage of potentially pathogenic bacteria in the hair
Using an improved technique for sampling, the carriage rate of Gram‐negative bacilli and Staphylococcus aureus in the hair was studied in two groups of surgical inpatients and two control groups
Meningitis following a combined spinalepidural technique in a labouring term parturient
  • M. Cascio, G. Heath
  • Medicine
    Canadian journal of anaesthesia = Journal canadien d'anesthesie
  • 1996
A 28-yr-old G1P0 at 40 wk gestational age presented in labour and requested analgesia who received a combined spinal-epidural (CSE) technique for labour analgesia and rapidly recovered without sequelae.
Microbiological laboratory hazard of bearded men.
The experiments showed that beards retained microorganisms and toxin despite washing with soap and water, and a sufficient amount remained to produce disease upon contact with a suitable host.