{"id":242447,"date":"2025-06-18T13:28:48","date_gmt":"2025-06-18T13:28:48","guid":{"rendered":"https:\/\/pharmeasy.in\/blog\/?p=242447"},"modified":"2026-03-25T11:33:23","modified_gmt":"2026-03-25T11:33:23","slug":"vaccine-influenza-b-what-is-it-causes-symptoms-treatment-prevention","status":"publish","type":"post","link":"https:\/\/pharmeasy.in\/blog\/vaccine-influenza-b-what-is-it-causes-symptoms-treatment-prevention\/","title":{"rendered":"Influenza B: What is It, Causes, Symptoms, Treatment & Prevention\u00a0"},"content":{"rendered":"\n\n<\/head>

Table of Contents<\/p>\nToggle<\/span>

Introduction<\/a><\/li>
What Causes Influenza B?<\/a><\/li>
Influenza B Symptoms<\/a><\/li>
How Influenza B Differs from Types A and C<\/a><\/li>
Who is At Higher Risk of Influenza B<\/a><\/li>
Diagnosis of Influenza B<\/a><\/li>
Complications<\/a><\/li>
Influenza B Treatment Options<\/a><\/li>
Prevention Tips<\/a><\/li>
When to See a Doctor<\/a><\/li>
Conclusion<\/a><\/li>
Frequently Asked Questions (FAQs)<\/a><\/li>
References<\/a><\/li><\/ul><\/nav><\/div>\n \n <\/span>\n $\"Join$ \n <\/a>\n
<\/span>Introduction<\/strong><\/span><\/h2>\n\n\n\nInfluenza B is one of the primary types of influenza viruses responsible for seasonal flu outbreaks across the globe ^{1<\/sup><\/a>. Among the estimated 1 billion cases of influenza that occur annually, influenza B contributes significantly, more commonly in children and adolescents, however, it can affect all age groups}^{1<\/sup><\/a>^,<\/sup>}^{2<\/sup><\/a>.\u00a0<\/p>\n\n\n\n}
Although less prevalent than influenza A, influenza B virus can co-circulate with it and have varying global impact based on season and region ^{3<\/sup><\/a>. Therefore, understanding what influenza B is, its symptoms and its management strategies is essential for effective prevention and treatment, especially during peak flu seasons.\u00a0<\/p>\n\n\n\n}
<\/span>What Causes Influenza B?<\/strong><\/span><\/h2>\n\n\n\nInfluenza B is caused by the influenza B virus, a member of the Orthomyxoviridae<\/em> family^{4<\/sup><\/a>. This virus is divided into two genetically and antigenically distinct lineages}^{4<\/sup><\/a>:\u00a0\u00a0<\/p>\n\n\n\n}
\n
B\/Victoria\/2\/87-like or the Victoria lineage ^{4<\/sup><\/a><\/li>\n\n\n\n}
B\/Yamagata\/16\/88-like or the Yamagata lineage (this lineage has not been detected since March 2020 and is expected to go extinct)^{4<\/sup><\/a>^,<\/sup>}^{5<\/sup><\/a>\u00a0<\/li>\n<\/ul>\n\n\n\n}
The influenza B virus spreads easily from person to person through respiratory droplets released when an infected individual coughs or sneezes, making close contact a key factor in transmission. It can also spread by touching contaminated surfaces and then touching your face without washing your hands ^{2<\/sup><\/a>.\u00a0<\/p>\n\n\n\n}
While influenza B typically leads to mild to moderate respiratory illness, particularly in otherwise healthy children, it can sometimes result in more severe disease. This is especially true for individuals with underlying chronic medical conditions, weakened immune systems, or other health vulnerabilities. In rare cases, it can even be fatal ^{4<\/sup><\/a>.<\/p>\n\n\n\n}
<\/span>Influenza B Symptoms<\/strong><\/span><\/h2>\n\n\n\nInfluenza B symptoms usually begin within 1 to 4 days after infection and can include ^{2<\/sup><\/a>^,<\/sup>}^{6<\/sup><\/a>:\u00a0<\/p>\n\n\n\n}
\n
Sudden onset of high fever\u00a0<\/li>\n\n\n\n
Dry, persistent cough (may last 2 weeks or more)\u00a0<\/li>\n\n\n\n
Headache\u00a0<\/li>\n\n\n\n
Muscle and joint pain\u00a0<\/li>\n\n\n\n
Severe fatigue or general feeling of unwellness (malaise)\u00a0<\/li>\n\n\n\n
Sore throat\u00a0<\/li>\n\n\n\n
Runny or congested nose\u00a0<\/li>\n<\/ul>\n\n\n\n
Note: <\/strong>Children (especially those under 5 years of age) may experience vomiting, abdominal pain and diarrhoea. However, these symptoms are not prevalent in adults^{7<\/sup><\/a>.\u00a0<\/p>\n\n\n\n}
<\/span>How Influenza B Differs from Types A and C<\/strong><\/span><\/h2>\n\n\n\n
Influenza B differs from types A and C in several important ways, including its virus structure, who it primarily affects, and the severity of the illness it causes:\u00a0<\/p>\n\n\n\n
Virus Strains:<\/strong>\u00a0<\/p>\n\n\n\n
\n
Influenza A has many subtypes (e.g., H1N1, H3N2).\u00a0<\/li>\n\n\n\n
Influenza B has two main lineages (B\/Victoria and B\/Yamagata)<\/strong>\u00a0<\/li>\n\n\n\n
Influenza C has no subtypes or lineages^{3<\/sup><\/a>.\u00a0<\/li>\n<\/ul>\n\n\n\nWho It Affects:<\/strong>\u00a0<\/p>\n\n\n\n}
\n
Influenza A infects humans and animals.\u00a0<\/li>\n\n\n\n
Influenza B and C infect only humans ^{8<\/sup><\/a>.\u00a0<\/li>\n<\/ul>\n\n\n\nSeverity:<\/strong>\u00a0<\/p>\n\n\n\n}
\n
Influenza A usually causes more severe illness.\u00a0<\/li>\n\n\n\n
Influenza B tends to be milder but can still be serious.\u00a0<\/li>\n\n\n\n
Influenza C causes mild, cold-like symptoms ^{2<\/sup><\/a>.\u00a0<\/li>\n<\/ul>}
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