Duration of the different development stages of house dust mites D farinae and D pteronyssinus under controlled condition, to pave the way in front of the workers in the field of house dust mite asthmatic

ABSTRACT

The present authors have clarified the importance of investigating the duration of the developmental stages of house dust mites for the purpose of immunoflourescence antibody test of house dust mite asthmatic bronchitis, perennial rhinitis and allergic dermatitis. This work is an addition to the previous studies and in which duration of the protonymphal, deutonymphal, and tritonymphal instars are investigated separately, the studies revealed that at 25°C and 75% R.H. for farinae and 80% R.H. for pteronyssinus shortest duration of different instars with minimal mortalities was obtained. Average durations of protonymphal, deutonymphal and tritonymphal instars of D. farinae at these most favourable temperature and relative humidity conditions were 4.2 +/- 0.8, 2.8 +/- 0.8 and 4.7 +/- 0.9 days respectively the corresponding figures of pteronyssinus were 4.3 +/- 1.2, 4.3 +/- 2.1 and 4.4 +/- 0.7, days respectively, the authors have discussed their findings with those of others in relation to the applied side of the work