Table 1.

Chronogram of observations related to yellow fever in the geographic distribution of golden lion tamarins, 2016–2019.

Date	Observation
November 2016–May 2017	Reports of dead howler monkeys in five locations in Macaé municipality. Two individuals tested positive for yellow fever.
March 2017	First death of a person caused by yellow fever in Rio de Janeiro state during this outbreak, Casimiro de Abreu municipality.
April–May 2017	Human deaths caused by yellow fever in Macaé and Silva Jardim municipalities.
October 2017, November 2017, January 2018, February 2018	Last observations of four groups of GLTs monitored by AMLD in Poço das Antas Biological Reserve (MU 6a). Subsequent efforts to locate these groups and four others with known territories were not successful.
April 2018	Report of a sick GLT in Aldeia I (MU 4). Remains of this individual were not recovered.
April 2018	Three recently dead howler monkeys found by AMLD in Poço das Antas Biological Reserve (MU 6a). Dead GLTs found in Imbaú I (MU 8) and Cambucaes (MU 6b).
May 2018	A second dead GLT found in Imbaú I (MU 8).
May 2018	Laboratory analysis confirms yellow fever in GLT found dead in Cambucaes (MU6b)44.
August 2018	AMLD recovered skeletons of four howler monkeys in Poço das Antas Biological Reserve (MU 6a).
October–December 2018	Deaths of at least 10 howler monkeys reported in a forest fragment in Casimiro de Abreu municipality46. One tested positive for yellow fever46.
April 2019	Three dead howler monkeys and two dead GLTs reported in Cambucaes (MU 6b). AMLD recovered part of the skeleton of one howler monkey. No remains of GLTs were found.