How do the public wear masks?

- Mar 21, 2020-

On May 19th, at the 35th press conference on the progress of joint prevention and control of the new crown pneumonia epidemic in Heilongjiang Province, Sun Wei, deputy director of the Heilongjiang Provincial Center for Disease Control and Prevention, gave a detailed introduction to "Guidelines for Wearing Scientific Masks."
The "Guidelines for Wearing Scientific Masks for the Public" classifies the general public, personnel in specific places, key personnel, and occupationally exposed persons, and makes scientific suggestions on wearing masks in different scenarios.

I. The general public

(1) Home and outdoor, no people gathered, well ventilated.

Protective advice: Do not wear a mask.

(2) Being in a crowded place, such as office, shopping, restaurant, conference room, workshop, etc .; or taking a box elevator or public transportation.

Protective suggestions: In medium and low-risk areas, you should bring a spare mask (a disposable medical mask or a surgical surgical mask) with you, and wear a mask when in close contact with other people (less than or equal to 1 meter). In high-risk areas, wear disposable medical masks.

(3) For those with cold symptoms such as coughing or sneezing.

Protective advice: Wear disposable medical masks or medical surgical masks.

(4) For those who live together with those who are separated from home and discharged from rehabilitation.

Protective advice: Wear disposable medical masks or medical surgical masks.

2. Personnel in specific places

(1) It is located in densely populated hospitals, bus stations, railway stations, subway stations, airports, supermarkets, restaurants, public transportation, and community and unit import and export places.

Protective suggestions: In medium and low-risk areas, workers wear disposable medical masks or surgical surgical masks. In high-risk areas, workers wear medical surgical masks or protective masks that comply with KN95 / N95 and above.

(2) In prisons, nursing homes, welfare homes, mental health medical institutions, school classrooms, construction site dormitories and other densely populated places.

Protective suggestions: In medium and low-risk areas, you should always wear spare masks (disposable medical masks or medical surgical masks), and wear masks when people gather or come into close contact with other people (less than or equal to 1 meter). In high-risk areas, workers wear medical surgical masks or protective masks that comply with KN95 / N95 and above; others wear disposable medical masks.

Key personnel

Suspected cases, confirmed cases, and asymptomatic infections of new coronavirus pneumonia; close contacts of new coronavirus pneumonia; immigrants (from entry to end of quarantine).

Protective suggestion: Wear medical surgical masks or non-exhalation valves in accordance with KN95 / N95 and above protective masks.

Occupational exposure

(1) Medical personnel such as general outpatient clinics and wards; emergency medical personnel in medical institutions in low-risk areas; administrative personnel, police, security, cleaning, etc. engaged in epidemic prevention and control.

Protective advice: Wear a surgical mask.

(2) Personnel working in the ward and ICU of patients diagnosed with a new type of coronavirus pneumonia, suspected case patients; medical staff at designated medical institutions for fever clinics; medical staff in emergency departments of medical institutions in middle and high risk areas; epidemiological investigations and experiments Room testing, environmental disinfection personnel; transfer of confirmed and suspected cases.

Protection advice: Wear medical protective mask.

(3) Operators engaged in the collection of respiratory specimens; staff who perform tracheotomy, tracheal intubation, bronchoscopy, sputum suction, cardiopulmonary resuscitation, or lung transplantation, pathological anatomy in patients with new-type coronary virus pneumonia

Protection suggestion: hood-type (or full-type) powered air-supply filter-type respirator, or half-face-type power-supply air-filter-type respirator with goggles or full screen; P100 anti-particulate matter is required for both types of respirator Filter elements, filter elements cannot be reused, protective equipment is used after disinfection.

Five, precautions for use

(1) Respiratory protective equipment includes masks and masks. Wash hands before wearing and removing.

(B) Pay attention to the front and back and up and down when wearing a mask. The mask should cover the nose and mouth, and adjust the nose clip to fit the face.

(3) Avoid touching the inside and outside of the mask with your hands during wearing. Take off the mask by taking off the cord at both ends.

(4) Wearing multiple masks cannot effectively increase the protective effect, but instead increases respiratory resistance and may damage the adhesion.

(5) There is no evidence to prove the effectiveness of various measures such as cleaning and disinfection of masks.

(6) Both disposable medical masks and medical surgical masks are used for a limited time, and the cumulative use does not exceed 8 hours. Occupational exposure personnel do not use masks for more than 4 hours and cannot be reused.

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