Provided is an immunostimulatory preparation which is a protein obtained by fusing a bacteria-derived heat shock protein (HSP: heat shock protein) and a viral peptide antigen, and enables induction of a highly diverse immunoglobulin by simultaneously stimulating nasal, respiratory, and oral administration. Provided are a feed, a feed additive, and an environmental symbiotic preparation for livestock, or a cosmetic, a food, and a quasi-pharmaceutical product for humans, which enable symbiosis with an environmental microorganism containing the immunostimulatory preparation. Provided are a preparation, a cosmetic for humans, a food, and a quasi-pharmaceutical product that enable symbiosis with environmental microorganisms utilizing livestock-derived IgA, IgG, and IgY among the immunoglobulins.

Provided herein are chimeric polypeptides that may be used, e.g., for the diagnosis of or vaccination against Ehrlichia chaffeensis and/or Ehrlichia canis.