Marteles, Diana Lebrero, María Eugenia Fernández, Antonio Ortín, Aurora González, Ana Morell, Carmen Villanueva, María Jesús Schäfer, Ingo Quílez, Pablo Verde, Maite Gómez, Alex Villanueva-Saz, Sergio Impact of single versus multiple infection on serum protein fractions in cats Vet. res. commun. 10.1007/s11259-025-10724-w 2025 2025