def METHOD_NAME(csv_str: str) -> pd.DataFrame:
    """Read a CSV in a str to a DataFrame and set the FIPS and DATE columns as MultiIndex."""
    return pd.read_csv(
        StringIO(csv_str),
        parse_dates=[CommonFields.DATE],
        dtype={CommonFields.FIPS: str},
        low_memory=False,
    ).set_index(COMMON_FIELDS_TIMESERIES_KEYS)