Complex sentence: In common clinical usage, neonatal sepsis refers to a bacterial blood stream infection in the first month of life, such as meningitis, pneumonia, pyelonephritis, or gastroenteritis, but neonatal sepsis can also be due to infection with fungi, viruses, or parasites.
Split into simpler sentences: In common clinical usage, neonatal sepsis specifically refers to the presence of a bacterial blood stream infection in the first month of life, such as meningitis, pneumonia, pyelonephritis, or gastroenteritis. Neonatal sepsis is most commonly due to bacterial infection, but it can also be due to infection with fungi, viruses, or parasites.