Fowl cholera immunization in turkeys. II. Use of experimental epornitic method to study vaccine efficacy in flocks of turkeys.
Groups of turkeys were challenged with Pasteurella multocida (P-1059) by the contact method. In this method, turkeys are artificially infected by the intramuscular injection of P. multocida organisms and are then introduced into the test group. The death patterns resulting from this contact method of challenge are either normally distributed or skewed to the right.
Studies on pasteurellosis. IV. Killed fowl cholera vaccine absorbed on aluminiumhydroxide.
HREE experiments are reported in this paper. Experiment A was a study to determine the efficacy of aluminum hydroxide gel as an adjuvant in killed fowl cholera vaccine. Expriment B was designed to determine (1) if this vaccine would stimulate and maintain a high degree of immunity for 52 weeks, and (2) if the stress of mixing vaccinated males from different flocks at time of challenge would affect their resistance to fowl cholera. Experiment C was a study to determine if birds could be immunized against fowl cholera and withstand exposure to virulent cultures of Pasteurella multocida while infected with fowl pox virus. A method for production of an effective water-in-oil emulsified fowl cholera veccine was presented in a previous paper.'
Calculation of Complex Radiant Heat Load From Surrounding Radiator Surface Temperatures
Abstract A method for calculating the radiant heat exchange between an absorber and individual radiating components in its surroundings is reported. Radiator surface temperatures, ambient and absorber temperatures, and configuration factors for radiating components in the surroundings are used in the customary radiant heat exchange formulae. Simplified methods for calculating or estimating configuration factors for radiators of various shapes solely from angles, subtended at the absorber by the radiators are presented. The method has been verified in the laboratory under controlled conditions and has been used to advantage in the field studies. The method has advantages over the globe therometer method in certain applications.