The spelling of "IBR IPV Virus" can be explained using the International Phonetic Alphabet (IPA). "IBR" is spelled as "aɪbiːɑː", "IPV" is spelled as "aɪpiːviː", and "virus" is spelled as "vaɪrəs". The use of IPA helps to accurately represent the pronunciation of the word, which can vary depending on dialect and accent. This spelling allows for clear communication and understanding between individuals from different regions and linguistic backgrounds.