HTML3

 + trong thẻ <a> có các thuộc tính khác nhau và tổng là có 3 thuộc tính:

- thuộc tính href: trong HTML nó được dùng để xác định con đường dẫn đến tài liệu mà ta muốn chuyển tới  


không chỉ vậy nó còn giúp ta xác định một vị trí bên trong trang web ta muốn di chuyển 

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Statistics in the world. Warnings from experts about the pandemic

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  COVID -19 variants are still dangerous Infection with the mutant variant of COVID-19 remains a threat to humanity. Doctors warn that people who have been infected with COVID-19 can completely become infected with another variant. More and more variants of the corona virus appear to be different from the one that was first discovered in Wuhan, China. Beta, Delta, and Omicron variants may increase the likelihood of reinfecting people who have recovered from earlier versions of the virus. However, the vaccines in use seem to offer significant protection from severe complications caused by the variants. COVID-19 and its variants are not going away anytime soon, which is why experts want a more unified approach to vaccine development and delivery going forward. Experts are trying to figure out the common ground between all the different variants. Will the current vaccine be effective against the new variants? Studies have shown that some of the immune responses of currently used vacci...
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vaccine ebonavirus

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  Ebola vaccine Ebola vaccine   are   vaccines   either approved or in development to prevent   Ebola . The first vaccine to be approved in the United States was   rVSV-ZEBOV   in December 2019.   It had been used extensively in the   Kivu Ebola epidemic   under a   compassionate use   protocol.   During the early 21st century, several vaccine candidates displayed efficacy to protect nonhuman primates (usually   macaques ) against lethal infection. Vaccines include replication-deficient adenovirus vectors, replication-competent vesicular stomatitis (VSV) and human parainfluenza (HPIV-3) vectors, and virus-like nanoparticle preparations. Conventional trials to study efficacy by exposure of humans to the pathogen after immunization are not ethical in this case. For such situations, the US Food and Drug Administration (FDA) has established the "animal efficacy rule" ...
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Some characteristics of the virus in humans.The formation of the virus.

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  Viral characteristics that cause disease. 1. Structure. Viruses, also known as superbugs, have structural characteristics, the type of replication in the host cell is different from those of intracellular parasitic bacteria. A virus is considered structurally complete when it is capable of producing the transfer of nucleic acid from one cell to another. Each virus has only one of two types of genetic material, either RNA (ribonucleic acid) or AND (deoxyribonucleic acid), without metabolic enzymes and respiratory enzymes so they are required to parasitize in other receptor cells. The structure of the virus includes: 1.1 General structure The two main parts are nucleic acid and capsid.          *  Nucleic acids: Each virus has only one of two types of genetic material, eitherRNA or DNA. Nucleic acids play an important role such as: Carrying genetic information,specific to each virus, determining the virus's ability to cause infection in the recept...
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