This publication is the first in a series on HIV/AIDS and agriculture in sub-Saharan Africa with the overall objective of providing a resource base on issues of rural development in a broad sense in the times of HIV/AIDS. This first book discusses the impact of the epidemic as it has emerged over the last decades at different levels of the agricultural sector, namely the farming system level, the livelihood level, and the household level. In a further step, impact on the agricultural estate sector as well as pastoralism is discussed. One overarching issue that emerges is the importance of gender attributes to adequately understand and address HIV/AIDS impact - the topic at the centre of the second part of the series. The text ends with a discussion of HIV/AIDS in relation to other shocks that befall rural livelihoods. It is followed by an annotated bibliography.