They also believe their inquiries will help determine if the two cases are linked in any way.
On June 5, a baby in the Special Care Baby Unit at the Womens and Childrens Hospital returned a positive swab for Serratia marcescens.
The infant is reported to be in a stable condition.
That came after two babies at the Flinders Medical Centre were confirmed to have the infection earlier this week.
A number of other babies at Flinders have been found to have the bug on their skin but are not considered infected.
Deputy Chief Medical Officer Mike Cusack said until a connection between the cases was ruled out, authorities would act as if they were linked and take all necessary precautions.
“Clearly thats a possibility and thats one were actively investigating,” he said on Saturday.
“The likelihood is that is not the case. Though we have to treat it as it is until weve proven otherwise.”
Serratia can cause urinary and respiratory issues, and lead to pneumonia.
Dr Cusack said despite the rarity of infections, it was quite common for people to carry the bug.
“Its a very common organism in the environment,” he said.
“So as we stand here there will be this bug and other on the environment and on our skins.”
“The key issue is in a hospRead More – Source