The Centers for Disease Control and Prevention (CDC) said Thursday it had no suspected or confirmed US Ebola cases from the Sudan strain cases but urged healthcare workers to be aware of an outbreak in Uganda.
The CDC said it was "important for clinicians to obtain a detailed travel history from patients with suspected (Ebola virus disease) especially those that have been in affected areas of Uganda."
No vaccine has yet been approved for use with the Sudan strain, according to Reuters.
Earlier in September, an outbreak of Ebola has been declared in Uganda after health authorities confirmed a case of the relatively rare Sudan strain.
The WHO said there had been seven previous outbreaks of the Ebola Sudan strain, four in Uganda and three in Sudan.
It said Uganda last reported an outbreak of Ebola Sudan strain in 2012 and an outbreak of the Ebola Zaire strain in 2019.