Overview

Lung and respiratory tract infections are brought on by the respiratory syncytial virus (RSV). The respiratory syncytial virus (RSV) is highly prevalent, with most children contracting it by the age of two. Adults are also susceptible to RSV infection.

Respiratory syncytial virus (RSV) symptoms are minor and usually mimic the common cold in adults and older, healthy children. Usually, self-care techniques are sufficient to ease any discomfort.

Some individuals are more susceptible to serious infection from RSV than others. These individuals include older adults, those with heart and lung conditions, premature newborns, babies 12 months of age or younger, and those with weakened immune systems.⁵

The enveloped, negative-sense, single-stranded RNA virus known as the human parainfluenza virus (HPIV) is a member of the Paramyxoviridae family. HPIV can cause lower respiratory tract infections (LRTI) and upper respiratory tract infections (URTI) in immunocompromised adults, elderly people, and children, typically under the age of five. It ranks among the leading causes of newborn death and morbidity globally. The assessment and management of parainfluenza virus infection are reviewed in this exercise, which also emphasizes the importance of the interprofessional team in the care of patients with this illness.²

Parainfluenza virus

Healthcare professionals refer to the class of infectious organisms known as human parainfluenza viruses (HPIVs) as "parainfluenza." Numerous disorders of the lower and upper respiratory tract are caused by parainfluenza viruses. Shortness of breath, coughing, and sore throat are some of the mild to major symptoms of respiratory infections.

Infections with HPIV can strike anyone. They are typical in young children and newborns. Even if you have had an HPIV infection before, you could still have it again in your lifetime. After your first infection, which typically occurs in childhood, your chances of developing a serious illness are reduced.

There is a seasonal pattern to HPIV infections. During Fall, winter, and spring they are most prevalent.³

Types

There are four varieties of parainfluenza viruses that are widely known:

• HPIV-2 and HPIV-1. Colds and croup are more commonly caused by HPIV-1 and HPIV-2
• HPIV-3. It is more likely for HPIV-3 to infect the lungs and airways, leading to pneumonia, bronchiolitis, or bronchitis
• HPIV–4. Although HPIV-4 is less well understood, specialists believe it causes diseases related to HPIV-3³

Cause

HPIV spreads easily, primarily through sneezes. You can also contact HPIV by touching your mouth, nose, or eyes after contacting an infected surface. The virus can survive in the air for up to an hour.¹

Symptoms

Although each child's symptoms may differ, the following are the most typical:

• Runny nose
• Swelling or redness in the eyes
• Barking cough
• Loud breathing
• A shrill voice or sibilant sound over the back or chest
• Wheezing
• Fever
• Agitation
• Diminished hunger
• Throwing up
• Diarrhea¹

Diagnosis

Apart from a thorough examination and awareness of local outbreaks, your physician could employ the following methods to diagnose HPIV:

• Nose swab
• Chest x-ray
• Blood test¹
• Viral culture
•  Fluorescent antibody assay
• Molecular assay²

Differential diagnosis

• Respiratory syncytial virus
• Influenza types A and B
• Rhinovirus
• Metapneumovirus
• Adenoviruses
• WU polyomavirus
• Human bocavirus²

Treatment and management

There is no known cure for HPIV. When your child is infected, the virus needs time to run its course. Antibiotics are ineffective, as HPIV is viral, not bacterial. Instead, treatment focuses on reducing symptoms.

The majority of HPIV cases have mild symptoms that are manageable at home. Among the strategies to lessen the intensity of the symptoms are:

• Consuming a lot of liquids, including juice and water
• Ibuprofen or acetaminophen (as directed by your child's physician. If your kid has a fever or discomfort, try to keep them as quiet and relaxed as possible to ease their breathing.
• Install a cool mist humidifier in your child's space¹

Respiratory syncytial virus

RSV, also known as the respiratory syncytial virus, is a common respiratory virus that often causes mild, cold-like symptoms. RSV can be dangerous, although most people get better in a week or two. Hospitalization is more likely to be necessary in cases of severe RSV in infants and elderly persons. A vaccine to guard against severe RSV is available if you are 60 years of age or older. Consult your physician to determine whether it is appropriate for you. If you are expecting, you can have an RSV vaccination between weeks 32 and 36 of your pregnancy to protect your unborn child, or your unborn child can receive a preventative antibody.⁴

Mode of transmission

Individuals who have contracted RSV are typically contagious for three to eight days, however, they may start to show symptoms a day or two earlier. Even after they stop exhibiting symptoms, young infants and those with compromised immune systems might go on spreading the virus for up to four weeks. RSV is frequently exposed to and contracted by children outside of the home, such as at daycare facilities or schools. Afterwards, they could spread the infection to other family members.

RSV is able to endure for several hours on hard surfaces like crib rails and tables. It usually only survives for brief periods of time on delicate surfaces like palms and tissues.⁴

Symptoms

Four to six days following viral exposure is when respiratory syncytial virus infection signs and symptoms typically manifest. RSV typically causes moderate symptoms and indications that resemble the common cold in adults and older kids.

When an RSV infection is severe, it can move to the lower respiratory tract and result in pneumonia or bronchiolitis, which is an inflammation of the tiny airways that lead to the lungs.

• Wheezing is a high-pitched sound that is typically made when exhaling.
• Breathing too quickly or too difficult—the person might favour sitting up instead of lying down
• Skin that is bluish in color from oxygen deficiency (cyanosis)⁵

Treatment and management

It is advised that RSV vaccinations be limited to these groups:

• Adults 60 years of age and older: The CDC and FDA have approved two RSV vaccines (GSK Arexvy and Pfizer Abrysvo) and shared clinical decision-making in order to recommend them for adults 60 years of age and older
• Women who are expecting: To protect unborn children, one RSV vaccination (Pfizer Abrysvo) has been approved and is advised during weeks 32 through 36 of pregnancy
• Babies and a few early children: It has been approved and advised for infants and certain early children to get an RSV preventative antibody
• Refrain from using dirty hands to touch your face
• Steer clear of intimate gestures like kisses, handshakes, and sharing cups and cutlery with other people
• Doorknobs and mobile gadgets are examples of surfaces that should be cleaned often⁴

Comparison

In immunocompetent children under six years of age, respiratory infections are frequently caused by the respiratory syncytial virus (RSV) and the parainfluenza virus (PIV). These viruses are members of the paramyxovirus family, which is made up of enclosed single-stranded RNA viruses.

Clinical signs and symptoms in a healthy host might vary from a minor ailment to severe pneumonia, bronchiolitis, and croup. Reinfections do happen beyond the age of six, although they are less frequent and less severe.

Unlike healthy individuals, immunocompromised adults and children are susceptible to severe lower respiratory tract infections, which can have a substantial impact on their health and even result in death. PIV occurs all year round, while RSV infection, like that of the typical host, occurs in epidemics in the winter and spring.

Immunocompromised hosts frequently have upper respiratory tract symptoms that are comparable to those of healthy hosts, in addition to a greater frequency of sinusitis and lower respiratory tract symptoms. Particularly in patients with bone marrow transplants, lower respiratory tract infections can cause respiratory failure and even death.

The examination of specimens taken from the respiratory system is necessary for the diagnosis of PIV and RSV. For RSV, rapid diagnostic tests are easily accessible, while for certain PIV serotypes, their usage is less common. Both viruses are grown in primary cultures, which require several days to produce a positive result. In vitro, ribavirin, a broad-spectrum antiviral drug, effectively combats RSV and PIV. Ribavirin has proven to be helpful in treating newborns with RSV infection, according to clinical trials.

Nevertheless, there haven't been any clinical studies done on immunocompromised individuals with PIV or RSV infections. It appears reasonable to treat immunocompromised patients infected with RSV or PIV with ribavirin until otherwise demonstrated inappropriate, as infection with these viruses can be severe and life-threatening and therapy with ribavirin is generally benign.⁶

Summary

Parainfluenza virus and Respiratory Syncytial Virus (RSV) are both significant causes of respiratory infections, especially in children. Parainfluenza virus typically causes croup and bronchiolitis, while RSV is a common cause of bronchiolitis and pneumonia. While both viruses share similar symptoms, RSV tends to be more severe, especially in infants and older adults, often leading to hospitalization. Additionally, RSV can cause more serious complications such as respiratory failure. Both viruses highlight the importance of preventive measures like vaccination, good hygiene practices, and avoiding exposure to sick individuals, particularly for vulnerable populations like young children and the elderly.