Disease

My cat, Nickel, meowed at the door to be let in this afternoon, as she always does after her outdoor adventures. Today was different, though, because when I went to the door to let her in she was sitting next to a dead crow. I dont know if she killed the crow, or if she found it dead and brought it for me to admire. Regardless, my first thought was of West Nile Virus. Can you tell me if cats can catch West Nile Virus from crows (dead or alive)? If they can catch the virus, are they able to pass it to humans?

The principal function of feline blood, like that of human blood, is to transport oxygen and nutrients throughout a cats body tissues and to carry carbon dioxide and various waste materials away from them. But this is by no means the only vitally necessary role that this rich, red fluid plays. Typically accounting for five percent or so of a cats total body weight, the blood is a key contributor to many other processes, such as cell development, tissue repair and the warding off of infection. The components of a cats blood are virtually identical to those of human blood, notes Marjory Brooks, DVM, associate director of the Comparative Coagulation Laboratory at Cornell Universitys College of Veterinary Medicine. These components include red cells (erythrocytes), which are critical for oxygen delivery and also assist in the removal of toxic carbon dioxide; white cells (leukocytes), which help protect an animal against infection and parasitic disease; platelets, which promote clotting and wound healing; and a colorless fluid (plasma) in which these and other life-supporting blood components - such as hormones, proteins and salts - are suspended. Disorders directly associated with blood abnormalities may not be as easily recognized by owners as other feline diseases. That does not mean that they are necessarily less serious. On the contrary, says Dr. Brooks, the diagnosis of various feline blood disorders - including low platelet counts, low red cell counts, high white cell counts, clotting problems, blood-related cancers and even blood poisonings - are a common occurrence at the Cornell University Hospital for Animals (CUHA). And the diagnosis of one of these disorders - feline anemia - is apt to occur "weekly, at least," she says.

Whether happily playing with its favorite toy, vigorously pursuing a tiny mouse, or frantically fleeing from a mean-spirited predator, all of your cats activities rely on the controlled transmission of electrical signals among the billions of nerve cells (neurons) that are jammed into its little brain. In a normal cat, the transmission - or firing - of these signals is well controlled within the central nervous system. These neurons either fire or are inhibited from firing according to an animals shifting needs and desires. In the brains of cats affected with the disorder known as epilepsy, however, this elegant process goes awry. As Alexander de Lahunta, James Law Professor Emeritus of Anatomy at the Cornell Universitys College of Veterinary Medicine, explains: "Neurons are made to fire, so until the transmission of electrical signals is needed, they are kept in a static, inhibited state. If something interferes with that inhibition, an uncontrolled firing of neurons can occur - and that is the phenomenon commonly referred to as a seizure." Dr. de Lahunta describes the "classic" seizure as follows: "The animal suddenly begins to alter its behavior. It acts warily, as if it senses that something unusual is about to happen. It gets very tense, its muscles contract, causing stiffness and trembling. It begins to chew and to drip saliva, even though there is nothing in its mouth. Then the animal becomes increasingly rigid, falls to one side with its limbs extended, and starts paddling them. "Meanwhile, the cats entire body starts shaking - and at this stage, it may stop breathing for as long as 30 or 40 seconds. And then, the panting and shaking and everything else begins to slow down - and within a few minutes, the animal seems to be normal again."

When veterinarians ask, "How are things at home?" they probably dont want to hear about your mortgage, your migraines or Aunt Millie in the guestroom. They should be asking about "lifestyle" issues that might be affecting the health of your cat. Problem is, too few vets do, according to a report in the Journal of the American Veterinary Medical Association (JAVMA Vol. 233, No. 10) about client-veterinarian communications. The study compared verbal interactions during well-pet visits - the once-a-year checkups (or twice-yearly visits for older cats) as opposed to vet appointments when a medical problem prompted a visit. Typically, as it turns out, well-pet visits include more verbal interaction with the pets, according to the report: Wellness appointments included "twice as much verbal interaction with the pet as did problem appointments, and the emotional atmosphere of wellness appointments was generally relaxed. There were more social talk, laughter, statements of reassurance and compliments directed toward the client and the pet." In contrast, during problem visits, 90 percent of the talk focused on what the report called "biomedical topics." And that is a problem, the JAVMA report concluded, because "veterinarians may neglect lifestyle and social concerns that could impact patient management and outcomes" when focusing on biomedical issues.

Indications that your cat is experiencing a viral infection of its upper respiratory tract - which includes its nose, sinuses, pharynx and larynx - are similar to those that trouble you when you catch a cold: watery eyes, runny nose, wheezing, sneezing and coughing. Just as you are likely to be completely and permanently rid of your cold within a week or so, a cat, in most instances, will also get over the clinical signs of disease within a few days. In some cases, however, serious complications can occur. About 80 percent of feline upper respiratory infections are caused by either of two viruses: feline herpesvirus (FHV), also known as feline rhinotracheitis virus (FRV); and feline calicivirus (FCV). A third and far less frequent cause of upper respiratory infections in cats is Chlamydophilia felis, a bacterial agent. "All three of these organisms are very specific to cats," says Dr. Richard Goldstein, an associate professor of small animal medicine at Cornell Universitys College of Veterinary Medicine. None of these disease agents, he notes, is transmissible to humans or dogs.

Although its only the size of a golf ball, your cats brain is just about as complex and, when it comes to matters of vital concern, just about as capable as your brain. Of course, a cat uses its brain and the other components of its neurologic system to address needs and desires that are often different from yours. After all, you like to read books and watch movies; your cat likes to torment mice and play with balls of yarn. Sad to say, a cats neurologic system also resembles yours in the wide variety of serious disorders with which it can be afflicted, sometimes with fatal consequences. According to Curtis Dewey, DVM, an associate professor of neurology and neurosurgery at the Cornell University College of Veterinary Medicine, he and his colleagues typically treat four or five neurologically compromised cats each week at the universitys animal hospital.

Dear Elizabeth: Help! I am pregnant and really need some answers about Toxoplasmosis. I know (from reading CatWatch!) that people can be infected by eggs in a cats feces. I also understand that Toxoplasmosis is really dangerous during pregnancy, so I had my cat tested last week.

Among a normal, healthy, and properly cared-for cats many distinctive attributes is its astoundingly acute sense of hearing. While the human auditory system is capable of detecting sounds ranging in frequency up to about 20,000 vibrations per second, cats typically can sense sounds pulsating at 60,000 vibrations per second or greater. This impressive acoustic sensitivity has been honed over the ages to serve a cat in countless ways - signaling the stealthy approach of a dangerous predator, for example, or detecting the underground movement of a burrowing rodent. Although most cats will go through life without experiencing a serious problem with their ears, owners should know that a variety of conditions - including congenital defects, infections, trauma and age-related changes - can be extremely painful and may compromise an animals hearing. Most feline ear disorders are readily treatable and will not result in permanent hearing loss, notes James Flanders, DVM, an associate professor of surgery at Cornell Universitys College of Veterinary Medicine. However, some conditions may render a cat partially or totally deaf, especially if they remain unrecognized and untreated.

It may surprise you to learn that dental disease is the most common disease in cats. In fact, approximately 50 percent of all cats show signs of gum and teeth problems by the time they reach adulthood. What is dental disease and what can you do to prevent it from happening to your cat? Periodontal disease - which includes gingivitis and periodontitis - is a serious condition that, when left untreated, can lead to tooth loss and may even cause damage to vital organs because bacteria from the mouth can circulate through the bloodstream. Gingivitis is an inflammation of the gums that is caused when plaque bacteria accumulate on the tooth surface and in small pockets at the gumline called the gingival sulcus. According to Daniel Carmichael, DVM, a veterinary dentist at the Veterinary Medical Center in Islip, New York, "The gum tissue or gingiva senses the bacterial plaque, which causes the capillaries to dilate and bring in white blood cells, thus making the gums red, swollen and prone to bleeding."

An estimated two percent of the 80 million or more cats now living in the United States will at some point in their lives develop cancer, a disease marked by the uncontrolled proliferation of cells on or within an animals hard and soft body tissues. Thanks to dramatic advances in veterinary medicine, many types of feline cancer are manageable - sometimes even reversible - if the condition is recognized early in its development and the affected cat is treated promptly and appropriately. But any cancer that remains undetected and untreated until it has reached an advanced stage is very likely to prove fatal. The task of diagnosing and treating feline cancer falls, of course, to the expert veterinary oncologist. Owners, however, can play a significant role in spotting a cancerous lesion at its earliest stage of development, when it is most amenable to treatment. Indeed, there are measures that a cat owner can take to prevent certain types of feline cancer or at least to minimize the risk of their occurrence.

A healthy cats uniquely stunning physical traits - its power, agility and lightning-fast responses to external stimuli - are essentially attributable to its musculoskeletal system. In one way or another, this system is in operation 24 hours a day, whether a cat is hunting prey, escaping from predators, eating, drinking, napping, toying intently with a ball of yarn or digging its claws into your favorite piece of furniture. Unfortunately, cats are subject to a veritable host of disorders that can impair or totally impede the smooth operations of this impressively complex array of bones, muscles, tendons, ligaments and other tissues. Owners should be aware of the systems basic structure, various functions, and signs of its impairment, such as a noticeably altered gait, an apparent weakness in the joints, and the inability to chew and swallow food easily. As is the case with other feline disorders, says Christine Bellezza, DVM, a consultant at Cornell Universitys College of Veterinary Medicines Feline Health Center, early recognition and diagnosis of a cats musculoskeletal disorder are likely to improve the chances for its successful treatment.

A recent report in the Journal of the American Veterinary Medical Association provided encouraging reassurance that lessons were learned from the tragic melamine contamination of pet food in 2007. Several of the investigators in the study "Clinicopathologic, histologic, and toxicologic findings in 70 cats inadvertently exposed to pet food contaminated with melamine and cyanuric acid" (JAVMA Vol. 233, No. 5) were from Cornell, where the New York State Animal Health Diagnostic Center did some of the groundwork that led to the largest recall of cat and dog food in U.S. history. The 70 cats in this study were not privately owned, nor were they laboratory cats that were deliberately fed suspect food to see if theyd get sick. Rather, they were 70 animals (from a licensed commercial cattery) that happened to be engaged in scientific diet-preference studies when the melamine contamination problem hit the national news. It was their good luck, however, to be where expert veterinary medical care was immediately at hand.