H3N2 Plus Influenza Profile

The H3N2 Plus Influenza Profile is a comprehensive flu test package designed to detect common seasonal influenza viruses, including Influenza A, Influenza B, and Influenza A subtypes H1N1 and H3N2. Influenza, commonly known as the flu, is a contagious respiratory illness that affects the nose, throat, and lungs. Seasonal flu activity often increases during the monsoon and winter months, although infections can occur year-round.

Flu symptoms typically appear suddenly and may include fever, cough, sore throat, runny or stuffy nose, headache, fatigue, chills, and body aches. Because these symptoms can overlap with those of the common cold, COVID-19, and other respiratory infections, influenza testing can help identify the cause of illness and support timely medical care. While most people recover without complications, influenza can sometimes lead to severe illness, particularly in young children, older adults, pregnant women, and individuals with underlying health conditions.

By screening for Influenza A, Influenza B, H1N1, and H3N2 in a single test, the H3N2 Plus Influenza Profile offers a convenient and comprehensive approach to flu diagnosis without the need for multiple separate tests. Requiring only a throat and nasal swab sample and no special preparation, such as fasting, this package can help support timely diagnosis, recovery, and infection control.

The H3N2 Plus Influenza Profile may be beneficial for individuals experiencing flu-like symptoms, especially during periods of increased influenza activity, such as the monsoon and winter seasons.

Symptoms may include:

• Fever, chills, and sweating
• Cough and sore throat
• Runny or stuffy nose
• Headache
• Muscle and body aches
• Fatigue and weakness
• Eye pain, watery eyes, or sensitivity to light.
• Nausea, vomiting, diarrhoea, or stomach discomfort (more commonly in children).
• Irritability or fussiness (in children)

You may consider this test if you:

• Have symptoms of influenza.
• Develop flu-like symptoms that appear suddenly and worsen quickly.
• Have been in close contact with someone diagnosed with or suspected of having influenza.
• Want to distinguish influenza from other respiratory infections that can cause similar symptoms, such as the common cold or COVID-19.
• Live in or have recently travelled to areas experiencing increased flu activity.

This test may be particularly important for individuals at a higher risk of flu-related complications, including young children, older adults, pregnant women, people with weakened immune systems, and those with chronic health conditions such as asthma, diabetes, or heart disease. Early influenza testing can support timely diagnosis and appropriate medical care when symptoms first appear.

This is a diagnostic test and not a routine test. It is done only when someone has symptoms, and the doctor suspects an influenza infection. 

The following table shows when and how frequently you should take this test:

*It is ideal to take the test soon after symptoms develop. This is because antiviral medications work best when started within 48 hours of infection.

Testing helps confirm the diagnosis, guide infection control, and rule out other causes.

Note: Always consult your doctor before testing. Seek immediate care if symptoms worsen or persist.

The H3N2 Plus Influenza Profile helps detect common influenza viruses responsible for seasonal flu infections, including Influenza A, and its subtypes H1N1, H3N2, and Influenza B.

• Influenza A: One of the most common causes of seasonal flu outbreaks and respiratory illness worldwide.
• H1N1 (Influenza A subtype): Also known as swine flu, this strain can cause moderate to severe respiratory symptoms and may occasionally lead to complications in otherwise healthy individuals.
• H3N2 (Influenza A subtype): A seasonal influenza strain often associated with more severe illness and complications in older adults, young children, and people with underlying health conditions.
• Influenza B: A common cause of seasonal flu that frequently affects people of all age groups and is frequently reported during annual flu seasons. It can sometimes result in serious illness requiring medical attention.

Although Influenza A, H1N1, H3N2, and Influenza B can cause similar symptoms, identifying the specific strain can provide valuable insights into the infection. Different strains may affect age groups differently and may carry varying risks of complications, making strain identification useful for timely medical care and monitoring.

What to Expect Before the Test

• No special preparation or fasting is required for this test.
• You may be asked to rinse your mouth with water before sample collection.
• Staying well hydrated can help ensure a comfortable sample collection experience.

What to Expect During Sample Collection

• A trained diagnostic professional will collect the sample using a soft swab from the nose and/or throat.
• The swab is gently rotated for a few seconds to collect the required specimen.
• You may experience mild discomfort, a tickling sensation, watering of the eyes, or a brief urge to cough or gag, but these effects are temporary and usually resolve quickly.

What to Expect After the Test

• You can return to your normal daily activities immediately after sample collection.
• The collected sample will be sent to the laboratory for analysis.
• Results can help support timely diagnosis and appropriate medical care when interpreted alongside your symptoms and clinical history.

This RT-PCR-based influenza test screens for four common flu viruses:

• Influenza A
• H1N1 (Swine Flu)
• H3N2
• Influenza B

By detecting multiple influenza strains in a single test, the H3N2 Plus Influenza Profile offers a comprehensive approach to flu diagnosis.

The influenza tests (influenza A, B, H1N1, and H3N2 tests) are interpreted as detected/positive or not detected/negative (qualitative), rather than in numbers (quantitative). The table below helps you understand the influenza diagnostic test results and what they could mean:

Note: The test results may vary based on several factors, such as laboratory method used, sample quality, and the stage of infection.

The results in the reports can be interpreted as follows:

• Positive Influenza A: Indicates infection caused by the influenza A virus
• Positive Influenza B: Indicates infection caused by the influenza B virus
• Positive H1N1: Indicates swine flu infection caused by the H1N1 strain, which comes under influenza A type
• Positive H3N2: Indicates infection caused by the H3N2 strain, which comes under the influenza A type
• Multiple positives: May indicate a co-infection, which is a rare case, and might need medical review
• All negative results: Indicates no detectable influenza virus at the time of testing. A negative test doesn't completely rule out influenza if tested very early (<24hours), very late (>5-7 days), or if the sample quality is suboptimal.
• All negative results with symptoms: Indicates absence of influenza virus at the time of testing, but if symptoms are present, they can be due to a different virus or bacteria, or the result can be a false negative. Repeat testing or further evaluation may be needed in such cases.

Note: These interpretations are general guidelines and may not be applicable to all cases. Results are always to be considered along with symptoms and medical history. Always consult a doctor for accurate interpretation and appropriate care.