Effect of Chlamydiaphage phiCPG1 on the course of conjunctival infection with "Chlamydia caviae" in guinea pigs.
Over the last several years, four different phages of chlamydiae, in addition to a phage associated with Chlamydia psittaci isolated from an ornithosis infection in ducks over 25 years ago, have been described and characterized. While these phages and their chlamydial host specificities have been characterized in vitro, there is virtually nothing known about the interaction of the phage with chlamydiae in their natural animal host. phiCPG1 is a lytic phage specific for "Chlamydia caviae," which is a natural parasite of the guinea pig. In this study, guinea pigs were inoculated in the conjunctiva with suspensions of phiCPG1 and C. caviae and the effect on the development of pathology and on the course of chlamydial infection in the conjunctiva was determined. The presence of phage delayed the appearance of the peak level of chlamydiae in the animal and decreased the pathological response. Evidence for replication of the phage in C. caviae in the conjunctival tissue was observed. Modifying the ratio of phage to chlamydiae altered the course of infection and affected phage replication. There was no evidence for the phage increasing the virulence of C. caviae infection.
Rank
Roger G
RG
Departments of Microbiology and Immunology, University of Arkansas for Medical Sciences and Arkansas Children's Hospital Research Institute, Little Rock, Arkansas 72202, USA. rankrogerg@uams.edu
Bowlin
Anne K
AK
Cané
Stefania
S
Shou
Huizhong
H
Liu
Zhi
Z
Nagarajan
Uma M
UM
Bavoil
Patrik M
PM
D000818:Animals; D001435:Bacteriophages / Q000502:physiology*; D002689:Chlamydia / Q000821:virology*; D002690:Chlamydia Infections / Q000473:pathology / Q000821:virology*; D003234:Conjunctivitis, Bacterial / Q000382:microbiology* / Q000473:pathology; D005260:Female; D006168:Guinea Pigs; D006790:Host-Parasite Interactions / Q000502:physiology*; D016133:Polymerase Chain Reaction