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The addition of 10 hemolytic units of guinea pig complement has been shown to enhance the neutralizing capacity of respiratory syncytial (RS) immune sera produced in guinea pigs and ferrets. This same immune sera, when tested without complement, had little or no neutralizing capacity. The addition of complement to RS immune horse serum did not significantly increase its neutralizing capacity. Immune horse serum effectively neutralized RS virus without complement. Other studies indicated that a 50% tissue culture infective dose of between 30 and 100 should be used in RS serum neutralization tests and that incubation should be for 90 to 105 min at room temperature. The neutralizing capacity of guinea pig immune serum was not increased by the use of filtered virus. The rate of virus neutralization, however, was increased with the addition of 10 hemolytic units of complement. The neutralizing capacity of RS immune horse serum was much greater for filtered than for unfiltered RS virus. The addition of complement increased the rate of virus neutralization but did not increase the neutralizing capacity of the horse immune serum.

Effect of Complement and Viral Filtration on the Neutralization of Respiratory Syncytial Virus