Abstract
Chronic Infection![Figure][1] Great reed warbler CREDITS: (TOP TO BOTTOM) PITCHER ET AL. ; © BLICKWINKE /ALAMY Chronic infections are assumed to cause little damage to the host, but is this true? Migrant birds can pick up various species of malaria parasite while overwintering in the tropics. After initial acute malaria, migrant great reed warblers, which nest in Sweden and overwinter in Africa, are asymptomatically infected for life. Asghar et al. discovered that these cryptically infected birds laid fewer eggs and were less successful at rearing healthy offspring than uninfected birds. Furthermore, infected birds had significantly shorter telomeres (the protective caps on the ends of chromosomes) and produced chicks with shortened telomeres. Science , this issue p. [436][2] [1]: pending:yes [2]: /lookup/volpage/347/436?iss=6220
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