ABSTRACT
Outbreaks of highly pathogenic strains of avian influenza (HPAI) cause high mortality in avian populations worldwide. When spread from avian reservoirs to humans, HPAI infections cause mortality in about 50% of human infections. Cases of human-to-human transmission of HPAI are relatively rare, and have, to date, only been reported in situations of close contact. These transmissions have resulted in isolated clusters of human HPAI infections, but have not yet caused a pandemic. Given the large number of human H5N1 HPAI infections to date, none of which has resulted in a pandemic, we estimate an upper bound on the probability of H5N1 pandemic emergence. We use this estimate to provide the likelihood of observing such a pandemic over the next decade. We then develop a more accurate parameter-based estimate of the emergence probability and predict the likelihood that, through rare mutations, an H5N1 influenza pandemic will emerge over the same time span.
Subject(s)
Influenza A Virus, H5N1 Subtype , Influenza in Birds , Influenza, Human , Animals , Humans , Influenza in Birds/epidemiology , Influenza, Human/epidemiology , Models, Biological , PandemicsABSTRACT
BACKGROUND: Nanotechnology deals with the manufacturing of materials at the atomic and molecular scale. According to the National Nanotechnology Initiative, nanotechnology denotes those structures which are nearly in 1-100 nm size regime in at least one dimension. OBJECTIVE: Nanotechnology in drug delivery has been evidenced into nanocarriers that possess distinct properties both in vitro and in vivo, which may be used in targeting drugs to various diseases especially tumors. In the last few years, there has been a keen concern in the formulation of various new drug delivery systems employing nanotechnology. Different nanodevices or nanocarriers like liposomes, dendrimers, polymersomes, transfersomes, and nanoparticles etc. have been employed for the targeted drug delivery. CONCLUSION: This review summarizes the advances in nanocarriers in terms of their methods of preparation and potential applications especially in tumors.
Subject(s)
Antineoplastic Agents/therapeutic use , Nanostructures/chemistry , Neoplasms/drug therapy , Animals , Antineoplastic Agents/chemistry , Drug Delivery Systems , Humans , Particle SizeABSTRACT
The multiple pterygium syndrome is consist of wide range of fetal malformations which have a genetic linkage. A defect in embryonic acetylcholine receptor which can be inherited as autosomal recessive, autosomal dominant, or X-linked fashion is the cause of this syndrome. We present a sporadic case of lethal multiple pterygium syndrome.
