def get_beta(intrinsic_growth_rate, gamma, susceptible, relative_contact_rate):
    """
    Calculates a rate of exposure given an intrinsic growth rate for COVID-19
    :param intrinsic_growth_rate: Rate of spread of COVID-19 cases
    :param gamma: The expected recovery rate from COVID-19 for infected individuals
    :param susceptible: Current amount of individuals that are susceptible
    :param relative_contact_rate: The relative contact rate amongst individuals in the population
    :return: beta: The rate of exposure of individuals to persons infected with COVID-19
    """
    inv_contact_rate = (
        1.0 - relative_contact_rate
    )  # The inverse rate of contact between individuals in the population ## get_beta_icr_exp
    updated_growth_rate = (
        intrinsic_growth_rate + gamma
    )  # The intrinsic growth rate adjusted for the recovery rate from infection ## get_beta_ugr_exp
    beta = updated_growth_rate / susceptible * inv_contact_rate  ## get_beta_beta_exp

    return beta