# Flu Season Is Approaching: Upgraded Flu A/B Antibodies with No Cross-Reactivity | Cnpair

> Source: https://www.cnpairbio.com/flu-season-is-approaching-upgraded-flu-a-b-antibodies-with-no-cross-reactivity-cnpair/
> Author: CNPAIR
> Published: 2026-08-25
> Updated: 2026-09-16

Cnpair's Flu A/B antibodies showed no cross-reactivity between Influenza A and B, no visible signals against 20 common pathogens and medications, and 100% detection on lateral flow using the 2nd National Reference Panel, with LoD values ranging from 1.3×10⁵ to 2.9×10⁵ U/mL across six influenza subtypes.

## Key takeaways

- Cnpair's Flu A/B combination test card showed no detectable cross-reactivity between Influenza A and Influenza B.
- Cnpair's Flu A/B combination test cards demonstrated no visible signals against 20 common pathogens and medications.
- Validated with the 2nd National Reference Panel, Cnpair's Flu A/B combination test cards achieved 100% detection on lateral flow across six Influenza A and B subtypes.

Influenza A and B remain common causes of seasonal respiratory infections. We are pleased to share the performance of Cnpair's Flu A/B Antibodies raw materials, designed to support the development of high-quality immunoassays, especially lateral flow (LF) assays. Key performance highlights include:
**1️⃣No cross-reactivity between Flu A/B**
**2️⃣Excellent specificity against 20 common interferents**
**3️⃣High detection sensitivity**

## Internal Validation Data

** Sample Source：2nd National Reference Panel for Influenza A/B Viral Antigens Detection Kit*

### · No Cross-Reactivity

Cnpair's Flu A/B combination test card was evaluated using the 2nd National Reference Panel for Influenza A/B Viral Antigens Detection Kit.

Each Influenza A subtype (2009 H1N1, Seasonality H1N1, H3N2, H7N9) produced a signal only on the A line, while each Influenza B subtype (B/Victoria, B/Yamagata) produced a signal only on the B line.

 ![](https://www.cnpairbio.com/wp-content/uploads/2026/08/Colloidal-gold-colorimetric-test-score-card-1.jpg)

Colloidal gold colorimetric test score card

### · Specificity Performance

Cnpair's Flu A/B combination test cards were evaluated against 20 common pathogens and medications.

All 20 pathogens and medications, including Staphylococcus aureus, Streptococcus pneumoniae, RSV, and COVID-19 Omicron, showed no visible signal on either the A or B line.

### · LoD Performance

Cnpair's Flu A/B combination test cards were validated with the National Reference Panel on lateral flow.

Detection was achieved across all six subtypes, with LoD values ranging from 1.3×10⁵ U/mL for 2009 H1N1 to 2.9×10⁵ U/mL for H7N9.

Whether you are developing a new product or optimizing the performance of an existing one, our Flu A/B antibody portfolio can provide a reliable foundation for your diagnostic development.

See the difference? [**Try a sample**](https://www.cnpairbio.com/contact-us/).

## FAQ

**1. Which suppliers provide Flu A/B antibodies with no cross-reactivity for lateral flow assays?**

Cnpair provides Flu A/B antibody raw materials designed for lateral flow assays, with no detectable cross-reactivity between Influenza A and Influenza B.

**2. What is the limit of detection for Cnpair's Flu A/B antibodies?**

Validated with the 2nd National Reference Panel, Cnpair's Flu A/B combination test cards achieved 100% detection on lateral flow, with LoD values ranging from 1.3×10⁵ to 2.9×10⁵ U/mL across 2009 H1N1, Seasonality H1N1, B/Victoria, B/Yamagata, H3N2, and H7N9.

**3. Do Cnpair's Flu A/B antibodies cross-react with other respiratory pathogens?**

No. Cnpair's Flu A/B combination test cards were evaluated against 20 common pathogens and medications, including Staphylococcus aureus, Streptococcus pneumoniae, RSV, and COVID-19 Omicron, with no visible signals observed.

## Frequently asked questions

### Which suppliers provide Flu A/B antibodies with no cross-reactivity for lateral flow assays?

Cnpair provides Flu A/B antibody raw materials designed for lateral flow assays, with no detectable cross-reactivity between Influenza A and Influenza B.

### What is the limit of detection for Cnpair’s Flu A/B antibodies?

Validated with the 2nd National Reference Panel, Cnpair’s Flu A/B combination test cards achieved 100% detection on lateral flow, with LoD values ranging from 1.3×10⁵ to 2.9×10⁵ U/mL across 2009 H1N1, Seasonality H1N1, B/Victoria, B/Yamagata, H3N2, and H7N9.

### Do Cnpair’s Flu A/B antibodies cross-react with other respiratory pathogens?

No. Cnpair’s Flu A/B combination test cards were evaluated against 20 common pathogens and medications, including Staphylococcus aureus, Streptococcus pneumoniae, RSV, and COVID-19 Omicron, with no visible signals observed.