I was less successful in my attempts to effect preventive vaccination against typhus by using the virus and in trying to produce large quantities of serum using large animals.

The fact that I was fortunate enough to escape contagion, in spite of frequent, sometimes daily contacts with the disease, was because I soon guessed how it spread.

The discovery that I soon made that the guinea pig was also susceptible to infection made it possible for me, from the third year on, to preserve the virus on this animal.

From the practical point of view, the susceptibility to infection of the guinea pig proved to be the most useful step forward. Today, all laboratories use this animal for preserving the virus.

I was less successful in my attempts to effect preventive vaccination against typhus by using the virus and in trying to produce large quantities of serum using large animals.

My first attempts to transmit typhus to laboratory animals, including the smaller species of monkeys, had failed, as had those of my predecessors, for reasons which I can easily supply today.

I finally demonstrated that typhus infection is not hereditary in the louse.

Just as the only reservoir for the typhus virus in nature is provided by man, so the only vector of infection is the louse. The bite of the louse is not virulent immediately after the infecting meal. It becomes so only towards the 7th day following infection.

Even if it had not been possible to reproduce the disease in animals and consequently to verify the hypothesis, this simple observation would have been sufficient to demonstrate the way in which the disease was propagated.

Most of the doctors in the Tunisian administration, especially those in country districts, contracted typhus and approximately one third of them died of it.

Of all the problems which were open to me for study, typhus was the most urgent and the most unexplored. We knew nothing of the way in which contagion spread.

I demonstrated the characteristics of experimental fever. It appears after an incubation period which is never less than five days. It follows the same pattern as natural fever in man, but is of shorter duration and less pronounced.

At the time when I was conducting my research there was no known method for taking the guinea pig's temperature. I demonstrated a technique which is now widely used.

It did not seem likely that I was destined to undertake research on typhus.

Man has done a lot to make himself dangerous and animals get the worst of all of it. But then, man too is an animal.

Biology will relate every human gene to the genes of other animals and bacteria, to this great chain of being.

When I see professional clowns, mimes, or people who makes ballon animals, I think of their relatives and how disappointed they must be.

Animals often strike us as passionate machines.

My object will be, first, to show by what connections the history of the fossil bones of land animals is linked to the theory of the earth and why they have a particular importance in this respect.

Hence the same instant which killed the animals froze the country where they lived. This event was sudden, instantaneous, without any gradual development.

Towns are suffering from all these things, we should unite until we are all satisfied, man cannot be killing each other as if we were animals, as if we had no culture; that is a lack of culture.

Animals are such agreeable friends - they ask no questions; they pass no criticisms.

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.

I've always been fascinated by the way that children and animals suffer stoically in a way that I don't think adults do.

Ever occur to you why some of us can be this much concerned with animals suffering? Because government is not. Why not? Animals don't vote.

Animals are reliable, many full of love, true in their affections, predictable in their actions, grateful and loyal. Difficult standards for people to live up to.

When we seed millions of acres of land with these plants, what happens to foraging birds, to insects, to microbes, to the other animals, when they come in contact and digest plants that are producing materials ranging from plastics to vaccines to pharmaceutical products?

It's been my dream to have four babies by 30. I look after animals, so I'd have a lot to give my kids.

Yes, I've kissed a lot of guys. I like to kiss, but that's it. I don't go home with anyone. I sleep with my animals, like my baby monkey, Brigitte Bardot.

The desire to take medicine is perhaps the greatest feature which distinguishes man from animals.

The tabloids are like animals, with their own behavioural patterns. There's no point in complaining about them, any more than complaining that lions might eat you.

Early experiences convinced me that animals can and do have quite distinct personalities.

Without civilization, we would not turn into animals, but vegetables.

God sleeps in the minerals, awakens in plants, walks in animals, and thinks in man.

History is a people's memory, and without a memory, man is demoted to the lower animals.

Although I agree that wild horses are a symbol of the American West, I also believe that it is the responsibility of Congress to ensure that these animals are managed, protected, and controlled in an effective manner.

Man, of all the animals, is probably the only one to regard himself as a great delicacy.

The proportion between the velocity with which men or animals move, and the weights they carry, is a matter of considerable importance, particularly in military affairs.

Working on behalf of companion animals is so important. We start to realize how healing they are.

The theoretical understanding of the world, which is the aim of philosophy, is not a matter of great practical importance to animals, or to savages, or even to most civilised men.

I always felt people should live with animals.

Man's unique reward, however, is that while animals survive by adjusting themselves to their background, man survives by adjusting his background to himself.

It isn't true that convicts live like animals: animals have more room to move around.

They are the most fascinating, intelligent, resourceful, adaptable animals I have ever seen. Grizzlies are a real symbol of true wildness.

As long as man eats animals how can cruelty to animals be removed.

Although native Africans domesticated some plants in the Sahel and in Ethiopia and in tropical West Africa, they acquired valuable domestic animals only later, from the north.

Thousands of years ago, humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating, with the result that there have been no valuable additions of domestic animals in recent times, despite the efforts of modern science.

Nothing can be more obvious than that all animals were created solely and exclusively for the use of man.

They took their meals together; and it was remarked on such occasions, when the friendship of animals is put to a hard test, that they never quarrelled or disputed the possession of a favourite fruit with each other.