fighting+virusesPPT
Viruses are a group of small biological particles that can only survive and m...
Viruses are a group of small biological particles that can only survive and multiply in the host cell. Due to their unique survival mode, viruses pose a great threat to human health. In the face of viruses, we should first know about their characteristics, types and transmission modes, so as to better prevent and control them.Characteristics of virusesViruses are a kind of biological particles that can only survive and multiply in the host cell. They are composed of protein, nucleic acid and other substances. They are too small to be seen directly under the microscope, and need to be observed with the help of electron microscopy.Types of virusesViruses can be divided into different types according to their size, structure and other characteristics. According to their size, viruses can be divided into large viruses (such as poxviruses) and small viruses (such as enteroviruses). According to their structure, viruses can be divided into core viruses (such as picornaviruses) and envelope viruses (such as influenza viruses). According to their host, viruses can be divided into animal viruses (such as human influenza viruses) and plant viruses (such as tobacco mosaic viruses).Transmission mode of virusesViruses are usually transmitted through the following ways:Contact transmissionThis is the most common way of virus transmission. The virus is transmitted through contact between the infected person and others, such as shaking hands, hugging, kissing, etc. In addition, the virus can also be transmitted through contact with contaminated objects, such as door handles, telephones, etcAirborne transmissionSome viruses are transmitted through the air, such as influenza viruses. When an infected person coughs or sneezes, the virus will be carried in the air and spread to othersWaterborne transmissionSome viruses are transmitted through water, such as enteroviruses. When people drink water or eat food that is polluted with enteroviruses, they will be infectedVector-borne transmissionSome viruses are transmitted through vectors, such as mosquitoes carrying malaria. Mosquitoes are the vectors for malaria, which can spread the disease to humans through bitesPreventive measures for virusesTo prevent the spread of viruses, we can take the following measures:Keep distanceKeep a safe distance from others to reduce contact with viruses. This can be achieved by not shaking hands, hugging or kissing others when meeting themWear masksWear masks when going out to reduce the risk of being infected by respiratory viruses such as influenzaWash hands frequentlyFrequently wash hands with soap or disinfectant to remove viruses on the hands. This can effectively reduce the risk of being infected by viruses on the handsEat properlyEat properly and avoid eating raw or undercooked food to reduce the risk of being infected by enteroviruses through food
