"After controlling for [other] factors, we still find that temperature is a strong predictor of antibiotic resistance."
With worries about the disease spreading in Mbandaka, the WHO said the DRC risk is very high and the regional risk is high.
More than $25 million is newly pledged for an outbreak that has grown to 51 total cases, 28 confirmed.
Those with GBS and Zika had more severe symptoms, including facial weakness, and required more ICU care.
The study found no signifiant difference in patients with lower respiratory tract infections.
Four more illnesses have been reported, along with another death in a healthcare worker.
Meta-analysis finds that more than a quarter are infected or colonized with antibiotic-resistant bacteria.
"At this point, it's not cost beneficial to declare an international state of emergency," a WHO official said of the 45-case outbreak that has killed 25 people.
"This is a concerning development" the WHO director-general says.
Pools and hot tubs play host to a wide range of disease-causing microorganisms, warns the CDC.
The WHO says participation in the ring vaccination efforts will be voluntary.