I don't know about the Philippines, but in the US you can buy the infected Tenebrio beetles to feed to rats and establish the life cycle in the lab. International shipping of these might not be possible. Another approach might be to trap wild rats and look for the parasite. Have the beetles ready to infect when you find H.d.
Sir Christopher Whipps, thank you for the information. Sir,this would help me a lot. But, May I get also the contacts of the laboratory in the U.S which provides infected beetles? I would like to try if they are conducting international shipping... I really need it because I only have 1 month to conduct the experiment. Hoping for your immediate response. Thank you very much.