Do you need mice from a specific vendor? Eg. taconic vs Jax vs Charles river

It might be interesting to compare different vaccines. In addition to spleen, shouldn't the draining lymph node be included?

It might be interesting to include peritoneal cavity for baseline and some infections. If Toxoplasma will be injected i.p. to initiate infection, peritoneal cavity might be important to include. In ovarian cancer, for example, there is involvement of peritoneal cavity (ascites).