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Most congenital malformations develop during the first 12 weeks of pregnancy when the foetus is growing very rapidly and developing the different limbs and organs. This is when the teratogen would have the most effect. Latter on, it is the general growth that affected.

Can you only get tetanus in a wound made by rusty, rather than a clean, object? No, the spores of tetanus are very common in our environment and it is certainly possible to infect yourself, even with an object that is apparently clean. However, the highest concentration of spores is certainly to be found in the soil and in manure, and something like a rusty nail is perhaps more likely to have been in contact with spores.; there before you might be a bit more likely to get an infection from such an object.

Are test-tube babies very expensive to produce?

Although not a great deal of expensive equipment is needed, a high level of labour, skill and experience is requiered so they are very expensive in terms of human resources. Moreover, the present low succses rate adds to the expense of each succsessful birth.

Are there dangers to the woman who has vitro fertilization?

There is little danger as the procedure for obtaining the ripened egg from the ovary is usually a straightforward one, which is carriedout under general anaesthetic. When the fertilized embryo is returned to the mother via the vagina no anaesthetic is necessary. The problem that the woman may have to cope withis not physical danger but disappointment should a lonnged for pregnancy not result.

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