Outer membrane protein of Ehrlichia canis and Ehrlichia chaffeensis

An isolated or purified polypeptide comprising a sequence chosen from the following:

• a P30 protein, a variant of the P30 protein, an antigenic fragment of the P30 protein, wherein the P30 protein consists of SEQ ID NO. 32;
• a P30a protein, a variant of the P30a protein, an antigenic fragment of the P30a protein, wherein the P30a protein consists of SEQ ID NO. 34;
• a P30-1 protein, a variant of the p30-1 protein, an antigenic fragment of the P30-1 protein, wherein the P30-1 protein consists of SEQ ID NO. 36;
• a P30-2 protein, a variant of the P30-2 protein, an antigenic fragment of the P30-2 protein, wherein the P30-2 protein consists of SEQ ID NO. 38;
• a P30-3 protein, a variant of the P30-3 protein, an antigenic fragment of the P30-3 protein, wherein the P30-3 protein consists of SEQ ID NO. 40;
• a P30-4 protein, a variant of the P30-4 protein, an antigenic fragment of the P30-4 protein, wherein the P30-4 protein consists of SEQ ID NO. 42;
• a P30-5 protein, a variant of the P30-5 protein, an antigenic fragment of the P30-5 protein, wherein the P30-5 protein consists of SEQ ID NO. 44;
• a P30-6 protein, a variant of the P30-6 protein, an antigenic fragment of the P30-6 protein, wherein the P30-6 protein consists of SEQ ID NO. 54;
• a P30-7 protein, a variant of the P30-7 protein, an antigenic fragment of the P30-7 protein, wherein the P30-7 protein consists of SEQ ID NO. 56;
• a P30-8 protein, a variant of the P30-8 protein, an antigenic fragment of the P30-8 protein, wherein the P30-8 protein consists of SEQ ID NO. 46;
• a P30-9 protein, a variant of the P30-9 protein, an antigenic fragment of the P30-9 protein, wherein the P30-9 protein consists of SEQ ID NO. 58;
• a P30-10 protein, a variant of the P30-10 protein, an antigenic fragment of the P30-10 protein, wherein the P30-10 protein consists of SEQ ID NO. 48;
• a P30-11 protein, a variant of the P30-11 protein, an antigenic fragment of the P30-11 protein, wherein the P30-11 protein consists of SEQ ID NO. 60;
• a P30-12 protein, a variant of the P30-12 protein, and an antigenic fragment of the P30-12 protein, wherein the P30-12 protein consists of SEQ ID NO. 62;
• and wherein the variants or antigenic fragments of each said P30, P30a, P30-1, P30-2, P30-3, P30-4, P30-5, P30-6, P30-7, P30-8, P30-9, P30-10, P30-11, P30-12 protein are immunoreactive with at least one antibody that binds to their corresponding protein.