Philadelphia (tca/dpa) — The 11-year-old cat had been vomiting and lethargic for several days, and showed little interest in food. When the pet was examined at the University of Pennsylvania’s Ryan Veterinary Hospital in September, her owner mentioned a possible clue to the symptoms: Someone in the household had Covid-19. The animal’s nasal swab turned up negative. A fecal sample, on the other hand, told the tale. The shorthair feline was infected with the delta variant. Scientists have now found the coronavirus in 29 kinds of animals, a list that has been steadily growing almost since the sta…