““The recently ill display similar biases, possibly, Schaller theorizes, because their immune systems may still be run-down, so their minds compensate by ratcheting up behavioral defenses. In support of that contention, he points to a provocative study by evolutionary biologist Daniel Fessler and colleagues, who showed that pregnant women become more xenophobic in the first trimester, when their immune systems are suppressed to prevent rejection of the fetus, but not in later stages of gestation, when that danger has passed.””
