Evaluation of Der p 10 in a Cohort of European Children: Role of Molecular Diagnostics and Clinical Features

Background

Allergy toward the dust mite is steadily increasing on the European continent. This sensitization may be a risk factor for developing sensitization to other mite molecules such as tropomyosin Der p 10. This molecule often correlates with food allergy and the risk of anaphylaxis after ingesting mollusks and shrimps.

Materials and Methods

We analyzed the sensitization profiles by ImmunoCAP ISAC of pediatric patients from 2017 to 2021. The patients under investigation were being followed for atopic disorders such as allergic asthma and food allergies. The study aimed to analyze the prevalence of sensitization toward Der p 10 in our pediatric population and assess the related clinical symptoms and reactions after ingestion of foods containing tropomyosins.

Results

This study included 253 patients; 53% were sensitized toward Der p 1 and Der p 2; 10.4% were also sensitized to Der p 10. Assessing patients sensitized to Der p 1 or Der p 2, and Der p 10, we observed that 78.6% were affected by asthma (p < 0.005) and had a history of prior anaphylaxis after ingestion of shrimp or shellfish (p < 0.0001).

Conclusion

The component-resolved diagnosis gave us a deeper understanding of patients' molecular sensitization profiles. Our study showed that a fair proportion of children sensitive to Der p 1 or Der p 2 are also sensitive to Der p 10. However, many patients sensitized to all three molecules had a high risk of asthma and anaphylaxis. Therefore, the assessment of Der p 10 sensitization should be considered in atopic patients with sensitization to Der p 1 and Der p 2 to avoid encountering possible adverse reactions after ingesting foods containing tropomyosins.

Comparison of neuroinvasive abilities of HSV-1 and HSV-2 in mice

We compared neuroinvasive properties of HSV-1 MacIntyre strain and HSV-2 G strain, after inoculation of mice by intraperitoneal, intranasal and intracaudal route, by scoring for encephalitis and death. HSV-2 was more neuroinvasive than HSV-1 by any route, since mice inoculated intranasally or intracaudally with HSV-2 required 100 fold lower dose than HSV-1 to induce encephalitis and death, which occurred earlier than in HSV-1 infected mice. HSV-2 was found in brain tissues at a lower concentration (10(1.8) to 10(2.7) PFU per 0.1 g of brain) than HSV-1. Mice inoculated with HSV-2 developed a more aggressive behavior than those inoculated with HSV-1, although they showed a lower virus concentration per gram of brain. These results showed that HSV-2 G strain was more neuroinvasive than HSV-1 MacIntyre strain and its ability to produce damage of CNS was not directly related to the amount of virus in it, and suggests that neuroinvasiveness is a complex phenomenon, which could involve viral genomic expression and evasion of the immune system.