ScAm - 09.2019

September 2019, ScientificAmerican.com 19

FROM “MAPPING HIV PREVALENCE IN SUB-SAHARAN AFRICA BETWEEN 2000 AND 2017,”
BY LAURA DWYER-LINDGREN ET AL., IN

NATURE,

VOL. 570; 2019

to make sure that treatment is scaled up”

and targeted to areas that need it most.

The ability to map at this level is “very

exciting,” adds Sten Vermund, dean of the

Yale School of Public Health, also not involved

in the new work. He thinks the World Health

Organization and the Joint United Nations Pro-

gram on HIV/AIDS (UNAIDS) should adopt

such methodology for their own reports.

Increases in prevalence are not necessarily

evidence of new HIV cases; people with the

virus may simply be living longer or moving

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“it’s also apparent that many people are not

receiving treatment.” Getting better estimates

of new cases is an important next step, she

adds: “There’s a lot of work still to be done.”

— Tanya Lewis

Prevalence of HIV in adults aged 15 to 49

in 2017, at the country level ( top ÊD³l‰þxUā

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portion of the population living with the virus.

0

5

10

15

20

25+

Prevalence bycountry (percent)

0

5

10

15

20

25+

Prevalence by

5 ×

5-km cell (percent)

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