Vaccine comprising a tick cement protein
The invention relates to the use of tick cement proteins in the production of vaccines for protecting animals against the bite of blood-sucking ectoparasites and against the transmission of viruses, bacteria and other pathogens by such ectoparasites. When used as vaccine components, the tick cement proteins of the invention confer broad cross-reactivity against a variety of species of ectoparasite.
1 . A vaccine composition comprising an immunogenic tick cement protein, a fragment thereof or a functional equivalent thereof in conjunction with a pharmaceutically-acceptable excipient.
2 . A composition according to claim 1 , wherein said tick cement protein, fragment thereof or functional equivalent thereof contains an immunogenic epitope that is present in one or more orthologous cement proteins of a blood-feeding ectoparasite species other than the tick species from which said immunogenic cement protein, fragment or functional equivalent is derived.
3 . A composition according to claim 1 or claim 2 , wherein said tick cement protein contains an immunogenic epitope that is also present in a gut protein of a blood-feeding ectoparasite.
4 . A composition according to claim 3 , wherein said blood-feeding ectoparasite is selected from a tick, a mosquito, a leech, a horsefly, a tsetse fly, a flea, a lice and a mite.
5 . A composition according to claim 2 that is effective against both adult and immature forms of the blood-feeding ectoparasite.
6 . A composition according to claim 1 , wherein said tick cement protein is derived from any one of the tick species Rhipicephalus appendiculatus, R. sanguineus, Amblyomma variegatum, Boophilus microplus, B. annulatus, Ixodes ricinus, I. persulcatus, and I. scapularis.
7 . A composition according to claim 6 , wherein said tick cement protein is derived from the tick R. appendiculatus.
8 . A composition according to claim 1 which contains a member selected from the group consisting of clone 21, clone 33, CemA, clone 24, clone 68, clone 64 and clone I and fragments thereof as an active component.
9 . A composition according to claim 1 which contains the 64trp cement protein, or a fragment or functional equivalent thereof, as an active component.
10 . A composition according to claim 9 , wherein said fragment is any one of 64trp1, 64trp2, 64trp3, 64trp4, 64trp5 or 64trp6, or a functional equivalent thereof.
11 . A composition according to claim 10 , wherein said fragment is 64trp2, 64trp6, or functional equivalents thereof.
12 . A composition according to claim 1 , wherein said tick cement protein is expressed in recombinant form.
13 . A composition according to claim 1 additionally comprising a second active agent.
14 . A composition according to claim 13 , wherein said second active agent is a second immunogenic protein, or protein fragment derived from a blood-feeding ectoparasite.
15 . A composition according to claim 1 additionally comprising an adjuvant.
16 . An antibody or an antiserum that is reactive with a tick cement protein.
17 . An antibody or antiserum that is reactive with a tick cement protein, wherein said tick cement protein is any of the cement proteins, fragments, or functional equivalents that are set forth in claim 1 .
18 . A method of production of an antibody or an antiserum reactive with a tick cement protein, comprising immunizing an animal with a vaccine composition as listed in claim 1 .
19 . A method of immunizing an animal against a blood-feeding ectoparasite comprising administering to said animal a vaccine composition as set forth in claim 1 .
20 . A tick cement protein, fragment thereof or functional equivalent thereof, for use in a vaccine.