Fg begins contact tracing of possible coronavirus cases vows to curb further spread

Here is a rewritten version of the sentence in a more formal and professional tone:

"The local health authority has initiated contact tracing for potential COVID-19 cases and is committed to containing the spread of the virus by identifying and isolating individuals who may have been exposed."

Here is a breakdown of the changes I made:

• "fg" is likely a typo and I assume you meant to write "the local health authority".
• "begins" is a good verb choice, but I replaced it with "initiated" to make the sentence more formal.
• "contact tracing of possible coronavirus cases" is a good phrase, but I rephrased it to make it more concise and clear.
• "vows" is a strong verb, but I replaced it with "committed" to make the sentence more formal and professional.
• "to curb further spread" is a good phrase, but I rephrased it to make it more specific and clear.