Overview
- Puno's regional health authority has reported roughly 379 confirmed cases as of May 27 with updates near 399 by May 28, and officials say cases now span about 20 districts across 12 provinces with Juliaca (San Román) the local epicenter.
- Arequipa has confirmed nine cases since the outbreak began, five of which have been classified as imported from Puno and four as locally acquired.
- Most cases detected in Arequipa are young adults under 30, a pattern regional officials link to gaps in two-dose measles vaccination coverage among that age group.
- Health authorities have ramped up response with large-scale vaccination campaigns and mobile brigades that have delivered thousands of MMR/SPR doses at universities, markets and transport hubs while maintaining active laboratory surveillance and contact tracing.
- Officials report no deaths so far but warn that an estimated regional gap of about 30,000 people still need vaccination—including roughly 3,000 children under five—which raises the risk of further spread as interregional travel and student movement continue.