Updated

Updated · Denver 7 Colorado News · Aug 23

Colorado Reports 18 Mpox Cases, Nearing 2025 Total of 21 as 7 Emerge Since Late July

Updated

Updated · Denver 7 Colorado News · Aug 23

Colorado Reports 18 Mpox Cases, Nearing 2025 Total of 21 as 7 Emerge Since Late July

Q: With Denver's recent mpox cases lacking known links, is a silent transmission chain already established in the city?

Possibly, but there is not enough evidence to say a sustained silent transmission chain is already established in Denver. What officials know is that six Denver cases since June 1 have no identified links or shared exposures. That can be an early warning of undetected spread, especially because mpox often moves through close physical or sexual contact networks that are not always fully captured by contact tracing. Research and outbreak experience also show transmission can occur before obvious rash appears, and some infections may be mild or undiagnosed, which makes “cryptic” circulation plausible. What officials do not have, based on the reported information, is proof of ongoing hidden community spread. The recent rise also fits a known seasonal pattern in Colorado, where spring and summer bring more travel, gatherings, heat, sweating, and close contact. Unlinked cases can reflect multiple separate introductions as well as one concealed chain. The practical implication is that Denver should act as if limited unseen transmission may be occurring, without overstating the evidence. That means rapid testing for any new rash, sore, bump, or blister after possible exposure; prompt isolation of suspected cases; vaccination for close contacts and higher-risk groups; and strong outreach to clinicians and sexual health networks. If additional unlinked cases keep appearing, especially without travel history, that would strengthen the case that a silent chain is in fact established.

3 articles · Updated · Denver 7 Colorado News · Aug 23

Colorado has logged 18 mpox cases in 2026, just three short of the 21 reported statewide in all of 2025, with seven of those infections identified since late July.
Denver accounts for much of the recent rise, recording six cases since June 1, and local health officials said the cases show no known links or shared exposures.
Health officials and clinicians tied the uptick to spring and summer patterns, saying travel, heat, sweating and closer social contact can create more chances for transmission through prolonged close contact.
Most Colorado cases this year involve adult men, with no infections reported in children, and the state is urging vaccination for close contacts and others at elevated exposure risk.