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Day90 带读训练 AIDS
About '3'7↗ 'million↗ 'people↗ a'round↗ the 'world / are 'currently 'living↗ with 'AIDS, ‘making↗ the dis'ease / one of the 'worst↗ pan'demics↗ / in 'modern↗ 'history↘.

'AIDS—or / Ac'quired↗ Im'munode'ficiency 'Syndrome—is a dis'ease↗ in which the 'human↗ im'mune↗ 'system↗ is se'verely↗ im'paired↘.It's 'caused by the 'Human Im'munode'ficiency 'Virus—or / 'HIV—and is the 'last↗ stage of the 'virus’s in'fection↘'HIV at'tacks↗ by 'entering the 'bloodstream / and at'taches to / 'Helper 'T / or / 'CD4 cells↘.A 'type of white 'blood↗ cell, 'CD4 cells↗ are res'ponsible for 'fighting in'fections↘.'First↗, 'HIV at'taches↗ it'self↗ to a 'CD4 cell and 'fuses with it↘.'Then, HIV re'leases its ge'netic↗ ma'terial / 'into the CD4 cell↗, which com'bines↗ with the cell’s↗ 'DNA↘.This 'allows↗ the 'virus to produce 'more HIV 'proteins 'inside the cell↘.The 'proteins are 'then↗ 'packaged and re'leased to at'tack 'other CD4 cells↘.With'out↗ 'HIV 'medicines, an 'individual's in'fection may s'pread, and wi'thin 10 to 12 'years↗, ad'vance↗ to become / 'AIDS↘.This de'creased im'munity makes 'patients with AIDS 'vulnerable to a 'number of diseases, including in'fections↗, de'mentia, and ‘cancer↘.

'Scientists↗ believed that 'HIV o'riginated in west central↗ 'Africa, where a 'similar virus was 'found in chimpan'zees and go'rillas↘.Around the 'turn↗ of the '20th century, the 'virus↗ was trans'mitted↗ to 'humans / due to the 'handling of chimpanzee 'meat↘.The virus 'then↗ spread from the 'African↗ continent during the 'mid 19'60s / through a 'single↗ 'carrier, e'ventually↗ 'making↗ its way around the 'world↘.In '1982, 'scientists 'labeled↗ the 'illness as 'AIDS, and the 'following↗ year / i'dentified↗ the 'virus as 'HIV↘.'Ever↗ since, about '77.3 'million↗ people a'round↗ the world have con'tracted 'HIV, with the ma'jority↗ of af'fected↗ 'indi'viduals 'living↗ in countries with 'very↗ few 'resources↘.

'Scientists↗ are working / to 'one↗ day de'velop / a 'cure for 'AIDS↘.In the 'meantime, ad'vancements in 'biotech'nology / plus in'creased a'wareness↗, pre'vention↗, and 'access to 'health care / are saving 'many↗ lives,and may 'hold↗ the 'key to 'finally↗ ex'terminating the dis’ease↘.

Day90 AIDS

Day90 AIDS

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