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Book Description paperback. Condition: New. Language:Chinese.Paperback. Pub Date: 2019-01-01 Publisher: China Social Sciences Press After the AIDS epidemic in sub-Saharan Africa for a quarter of a century. the average life expectancy of local residents has fallen for a full 20 years. Until now. humans have not yet developed a vaccine for AIDS. In this era. vaccines have often become the target of public opinion. and the above examples may remind. Seller Inventory # NL008629