Complex sentence: In reference to immune resistance and response, red and yellow-red morphs are the most susceptible to infection, as when tested with the haemogregarine parasite, a common parasite for these lizards, these two morphs had the highest infection rates and intensities.
Split into simpler sentences: In reference to immune resistance and response, red and yellow-red morphs are the most susceptible to infection. When tested with the haemogregarine parasite, a common parasite for these lizards, these two morphs had the highest infection rates and intensities.