2019-nCoV was named by the World Health Organization on January 12, 2020. Coronaviruses are a large family of viruses that cause severe diseases such as colds, MERS, and SARS. On March 11, the Director-General of the World Health Organization, Tan Desai, announced that the new coronavirus has constituted a global pandemic.

On March 21, 2020, more than 280,000 cases have been diagnosed worldwide.

The coronavirus mainly have three transmission modes: direct transmission, aerosol transmission and contact transmission.

Direct transmission

It is caused by the patient\'s sneezing, coughing, talking droplets, and exhaled gas inhaled directly in close proximity.

Aerosol transmission

The droplets are mixed in the air to form an aerosol, which causes infection after inhalation.

Contact transmission

The droplets are deposited on the surface of the item. After contact, the hands are contaminated, and then they contact with the mucous membranes of the mouth, nose, eyes, etc., and eventually become infected.

The medical mask is composed of a mask face and a tension band. The face mask is divided into inner, middle and outer layers.The inner layer is skin-friendly material, the middle layer is an isolation filter layer, and the outer layer is a special material antibacterial layer. It is highly hydrophobic and breathable, and has a significant filtering effect on micro-band coronavirus aerosols and harmful dust.

The medical mask is light, comfortable, odorless, glass fiber-free, waterproof, non-irritating to the skin.

It\'s soft and comfortable. It can also adjust the nose bridge

It has low breathing resistance and it is hygienic to wear.

Here are the mask types and objects.

Disposable medical masks

It is recommended for the public to use in non-personnel-intensive public places.

Medical surgical masks

It is recommended to wear them during suspected cases, passengers of the public transportation department, taxi drivers, sanitation workers, and service personnel in public places.

KN95 and N95 protective masks

It is recommended for field investigation, sampling and testing personnel. The public can also wear it in places with high concentration of people and closed public places.

Medical protective masks

It is recommended to wear them when sending out fevers, isolating ward medical staff and confirmed patients for transfer.

During the epidemic of the new coronavirus pneumonia, for the safety of yourself , your families and friends, Please don\'t forget to wear the medical mask. With the joint efforts of everyone, we will see the dawn and return to the normal life soon