Manslaughter charges brought against a Queensland couple after the death of their toddler from a rare genetic disorder have been dropped by police.

Three-year-old Penelope Campbell died in Townsville on July 7, 2022, a day after falling sick and vomiting at daycare.

Her parents, Jack and Breannon Campbell, were facing manslaughter charges, which were dismissed in Townsville Magistrates Court on Thursday.

A two-day committal hearing was told the couple had not been made aware that the disorder, M-CAD deficiency, could be deadly.

Police prosecutor Sam Stewart told the committal hearing he could not continue "in good faith", after hearing evidence from three medical witnesses.

"There is evidence the defendants were not made aware of the inherent risks of the condition, namely that it co

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