14th April 2020- Nigeria Centre For Disease Control Advisory On The Use Of Masks By Members Of The Public Without Respiratory Symptoms
Since the coronavirus disease (COVID-19) was first reported in Wuhan, China in December 2019, it has spread rapidly across the globe, leading to over a million confirmed cases in three months. On the 27th of February 2020, Nigeria confirmed its first case of COVID-19. Since then, the number of confirmed cases has gradually increased, with more sporadic cases reported across more states in Nigeria.
Nigeria is a densely populated country with about 200 million people across 774 Local Government Areas (LGAs) in 36 states and the Federal Capital Territory (FCT). This context and other socio- economic factors make the country particularly vulnerable for a highly transmissible virus such as SARS-CoV-2 to spread.
According to the World Health Organization (WHO), medical face masks should be worn primarily by people who show symptoms of COVID-19, health workers and people who are taking care of people with COVID-19 in close settings (at home or in a health care facility). The Nigeria Centre for Disease Control recommends the use of face masks by members of the public, as an optional additional layer and not as a compulsory measure, in addition to physical distancing, hand and respiratory hygiene measures in Nigeria. This is not a compulsory advisory, but it is an added recommendation in addition to the above measures.
Principles of prevention of COVID-19
SARS-CoV-2, the virus that causes COVID-19 is most frequently transmitted from one person to another, through droplets from coughing or sneezing. The virus can also be transmitted by touching surfaces that have been infected (e.g., door handles, countertops) or more rarely, from singing or speaking loudly.
Given what is understood about this new virus, the Nigeria Centre for Disease Control has advised on the following measures to prevent transmission:
• Physical distancing – i.e. people should keep a minimum distance of 2 metres from one another.
1. The wearing of face masks, (or equivalent) is recommended as an optional additional layer to be used in addition to other measures such as physical distancing, hand and respiratory hygiene measures in Nigeria. The primary rationale for the advice on face masks is to
Handwashing with soap and water should be performed as frequently as possible or using an alcohol-based sanitizer where no water is available.
If someone is coughing or sneezing, they should cover their cough, using a disposable tissue and discarding in a waste bin and washing their hands or using their bent elbow.
Normal practices like greeting one another with handshakes or hugging should be avoided.
Evidence relating to the community use of masks for prevention of COVID19
Globally, there is ongoing debate on the effectiveness of masks as a preventive measure for the coronavirus disease. The evidence in favour of the use of masks includes the possibility of asymptomatic (a person never develops symptoms) and pre-symptomatic (before a person develops signs and symptoms) transmission and emerging evidence of the ability of a mask to prevent contact with respiratory droplets. Ecological comparisons also appear to suggest better outcomes in countries that have used masks as a general policy. Sources of concern have been that people who wear face masks may feel protected and ignore physical distancing advice. In addition, if face masks are not worn correctly, disposed of appropriately or if people touch their faces more frequently due to adjustments of the face masks they are wearing, they run a higher risk of infecting themselves.
Increased anxiety among the public
The daily real-time reporting of the COVID-19 pandemic has heightened panic and fear in people, as the numbers of cases and deaths recorded globally continues to increase. There is a lot that remains unknown about this disease. Authorities and scientists do not yet have all the answers to the many questions being asked. The instinct for self-preservation and protection from harm and the basic need to survive has brought about a need for self-defence against this novel virus. Many people will be resorting to the use of face masks to gain some control and confidence in their ability to protect themselves (and family) from contracting the coronavirus disease.
In view of these, the Nigeria Centre for Disease Control offers the following advice to members of the public: