Skip to content
FOI Clinical
8 min read Weekly News

FOI Clinical - Issue 17

The FIFA World Cup opens June 11 across 16 cities in the U.S., Canada, and Mexico. The Bundibugyo Ebola outbreak has tripled to 321 confirmed cases, now the third-largest in history. New York confirmed its first human Bourbon virus case.

Welcome to the seventeenth edition of FOI Clinical. Each week, we'll send you a briefing on outbreak news. When something urgent breaks, you'll get an alert the same day.

In this edition

FIFA World Cup 2026 - West Nile virus - Hantavirus (domestic) - Tick-borne diseases and Bourbon virus - Cryptosporidiosis - Norovirus - Flea-borne typhus - Coccidioidomycosis - Hantavirus: MV Hondius - Measles - Mumps - Legionellosis - Mpox - COVID-19 summer wave watch

💡
A note on this week's data: The recent reporting week (ending May 24) was affected by the Memorial Day holiday. Weekly case counts dropped sharply across nearly every disease: campylobacteriosis, salmonellosis, legionellosis, pertussis, and others all fell 50–95% from prior weeks simultaneously, a pattern consistent with delayed reporting rather than any real epidemiological shift. To account for this, we focus on year-to-date comparisons this week.

National interest

FIFA World Cup 2026: what clinicians should know

The FIFA World Cup begins June 11 across 16 host cities in the U.S., Canada, and Mexico, running through July 19; 48 teams, 104 matches, and an estimated 6.5 million fans will attend stadiums, with millions more at fan festivals, public viewing events, and transit hubs. 

Multiple public health agencies have issued preparedness assessments, including PHAC, Public Health Ontario,  BCCDC, NYC DOHMH, Massachusetts DPH, Rhode Island DPH, and Philadelphia DPH.

In Mexico, notable infectious disease events include 17,719 confirmed measles cases (41 deaths) from 2025 through May 25, with Jalisco (Guadalajara, a host city) accounting for 6,225 cases alone. Over 20,000 dengue cases have been reported nationally, again with Jalisco leading. Zika remains active in host cities: Jalisco has 680+ confirmed cases and Nuevo León (Monterrey) has 900+. Rocky Mountain spotted fever (fiebre manchada) is a tick-borne concern in northern Mexico, including Monterrey.

In the U.S. and Canada, the tournament coincides with peak seasons for West Nile virus, tick-borne diseases, and foodborne illness, all amplified by above-average temperatures forecast for June–July. Canada lost its measles elimination status in November 2025 and has reported over 1,000 cases across seven jurisdictions. Tick bite-related ER visits in the U.S. reached their highest seasonal level since 2017 in April 2026. Ebola screening is active at three U.S. entry airports (Dulles, Atlanta, Houston), with Houston hosting DRC's national team on June 17.

Share Share Share Share Share Email

Read next

FOI Clinical - Issue 16

FOI Clinical - Issue 18