By the beginning of the 21st century, the transmission of the virus from mother to child was the main cause of the spread of the virus.
After careful investigation of the composite plots of surface pressures, temperatures and wind flows on day 0 of each selected H5N1 outbreaks (Figs. S3, S4, S5, S6 and S7), the arrival of colder air from higher latitude region may be the main cause of the spread.
This inappropriate use of antibiotics is believed to be a main cause of the spread of bacterial resistance [ 9].
Colonised children are the main cause of the spread of the pathogen.
The main cause of the virus's spread in the county is sexual transmission – mainly by young migrant workers returning home from other parts of China.
The NIC report suggests that in the next-wave countries those vulnerable groups differ significantly from place to place.In China, for example, one of the main causes of the spread is poor farmers selling blood to illegal brokers.
The main cause of the deaths was the spread of sombeesa [bovine pleuro-pneumonia]….
But it wasn't clear whether the potential pathogen was the main cause of the epidemic, which has spread plaguelike throughout the northeastern United States, or just a side effect.
The main cause of these deaths is metastatic spread of the disease (Dowsland et al, 2003).
Systemic metastatic spread represents the main cause of breast cancer related morbidity and death.
