Nidovirales is an order of viruses that includes important human and animal pathogens, such as coronaviruses and arteriviruses. A "Nidovirales infection" refers to the condition where an individual or animal is infected with a virus belonging to this order. These infections can cause a wide range of symptoms depending on the specific virus and the host's immune response.

Coronaviruses, for example, can cause respiratory illnesses in humans, ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). In animals, coronaviruses can cause gastrointestinal diseases, such as feline infectious peritonitis in cats and transmissible gastroenteritis in pigs.

Arteriviruses, on the other hand, primarily infect animals and can cause respiratory and reproductive diseases. Porcine reproductive and respiratory syndrome (PRRS) is a significant disease caused by an arterivirus in pigs, resulting in significant economic losses to the swine industry worldwide.

In summary, Nidovirales infections refer to the condition where an individual or animal is infected with a virus belonging to the order Nidovirales, which can cause a range of symptoms depending on the specific virus and the host's immune response.

Nidovirales is an order of viruses that includes important pathogens such as coronaviruses and arteriviruses. These viruses are characterized by their large, complex genomes and the production of nested sets of subgenomic mRNAs during replication. They have a positive-sense, single-stranded RNA genome and are enveloped. The name "Nidovirales" is derived from the Latin word "nidus," meaning "nest," which refers to the nested set of subgenomic mRNAs produced during replication.

Coronaviruses, which include well-known human pathogens such as SARS-CoV, MERS-CoV and SARS-CoV-2 (which causes COVID-19), primarily infect the respiratory tract and can cause a range of symptoms from mild cold-like illness to severe pneumonia.

Arteriviruses, on the other hand, mainly infect animals and are associated with diseases such as porcine reproductive and respiratory syndrome (PRRS) in pigs and simian hemorrhagic fever in non-human primates.

It's important to note that Nidovirales have a high potential for cross-species transmission, which can lead to the emergence of new viruses with the ability to infect humans and cause disease.

I'm sorry for any confusion, but there seems to be a mistake in your question. "Arteritis Virus, Equine" is not a recognized medical term or virus in humans or animals. There is a condition called "Equine Viral Arteritis (EVA)," which is a viral disease that affects horses and other equine species. However, it does not affect humans.

Equine Viral Arteritis (EVA) is caused by the Equine Arteritis Virus (EAV). This virus primarily affects the respiratory system and can cause symptoms such as fever, lethargy, loss of appetite, and a runny nose in infected horses. In some cases, it may also lead to inflammation of the lining of blood vessels (vasculitis), which can result in abortion in pregnant mares or infertility in stallions.

It's essential to maintain proper biosecurity measures when dealing with horses, especially those that have been exposed to EVA, to prevent its spread and protect the health of other equine populations.

Torovirus is a genus of viruses in the family Coronaviridae. It is a single-stranded, positive-sense RNA virus that primarily infects the epithelial cells of the intestinal tract of various animals, including humans. In humans, torovirus infection can cause gastroenteritis, characterized by diarrhea, vomiting, and abdominal cramps. The virus is transmitted through the fecal-oral route and is highly contagious. Torovirus infections are more common in young children and immunocompromised individuals.